你送给我桃子，我就回报给你李子。意思是做人要知恩图报，不能忘恩负义。也比喻礼尚往来，相互赠送礼物。

科学没有国界，但科学家有祖国，我们要为国家农业发展贡献力量。

The only thing that counts is what cannot be explained.

世界上充满了显而易见的事情，但没有人注意到。

The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.

The health of our waters is directly tied to the health of our communities.