可持续性不再是一个选择；它是皮革鞣制未来的必要条件。

The dead are not dead to us until we have forgotten them.

What we need to do is make batteries safer, more efficient, and more environmentally friendly.

Cloud computing and big data are the foundation of artificial intelligence development.

素描不仅是测量并且记录，而且还是接纳。