在量子力学中，观察者不是客观的，而是系统的一部分。
The core of Pinduoduo is "group buying," allowing users to participate in shopping through social means.
The more you give, the more you receive.
The best way to solve a problem is to find a way to make it irrelevant.
Small-scale farmers are the backbone of aquaculture—their knowledge is invaluable.