German engineer Martin Holzheid shows a design sketch of Taurus milling machine in Shanghai, east China, Oct. 17, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

German engineers Martin Holzheid (L) and Lucas Rebhan work at the assembly site of Taurus milling machine in Shanghai, east China, Oct. 17, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Workers make preparation for lifting operation of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Workers lift the components of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

German engineers Martin Holzheid (front) and Lucas Rebhan work at the assembly site of Taurus milling machine in Shanghai, east China, Oct. 17, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

German engineer Martin Holzheid (C) checks the position of a key component of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Workers lift the components of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Workers lift the components of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Staff members work at the assembly site of Taurus milling machine in Shanghai, east China, Oct. 17, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)

Workers lift the components of Taurus milling machine in Shanghai, east China, Oct. 22, 2018. Preliminary assembly of the milling machine, which will be the largest exhibit to be on show at China's upcoming import expo, was finished here on Monday. The exhibit is expected to cover 200 square meters of exhibiting space during the expo, which is scheduled to be held in Shanghai on Nov. 5-10. (Xinhua/Fang Zhe)