Excess water from irrigation sinks down into the water table.

灌溉产生的多余水分渗入地下水。

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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。

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My heart sinks down, tears surge out.

妾心沉落，泪涌似涛。

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She, too, has her back to the wall, on the other side of the stairwell, and she sinks down onto her haunches when Buller turns the gun on her.

CNN: Books - Excerpt: 'Flint'

Sinks are going down the drain, and steel is now heading in the same direction.

FORBES: Chinese Manufacturing Is Crashing

The town of maybe a few hundred people is locked in a self-sustaining cycle of grief after a school bus slides off the road one morning, careens down a slope, and sinks in an icy lake.

CNN: Review: Vengeance in a town full of grief in 'The Sweet Hereafter'