1. The most beneficial forms of exercise, he says, engage both.
    他说，最有益的运动是身心兼顾。

2. Sunshine and rain are beneficial to the crops in the fields.
    日光和雨水有利于田间作物。

3. One researcher is attempting to show this experimentally with a study in which groups of parents are taught how to have beneficial conversations with their small children.
    一名研究人员试图通过实验论证这一观点。在他的研究里，几组家长学着如何与自己的幼小子女作有益的交谈。