If an ocean floor tectonic plate meets the edge of a continent and they push against each other, the heavier one sinks down and goes under the other one.
如果一个海底构造板块与大陆边缘接触并相互挤压,较重的板块下沉到另一个的下面。
2
She put her hands under the leaves and began to pull and push them aside.
她把她的手放在树叶下,开始把它们推拉到一边去。
3
It's true that an aging population and rising health care costs will, under current policies, push spending up faster than tax receipts.