问题描述：
一句话里只能有一个谓语是吗
Scientists think that losing leaves helps some trees to concerve water in the winter.这里面的helps 是宾语从句里的一部分吗 还有Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them中的yield
Scientists think that losing leaves helps some trees to concerve water in the winter.这里面的helps 是宾语从句里的一部分吗 还有Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them中的yield
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