当水从板下的一个腔中被抽出来产生负压时，可伸缩的传感器被向下拉，形成一个凹形。

When water is pumped out of a chamber below the plate creating negative pressure, the stretchable sensors are pulled down, producing a concave shape.

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我来检查看看仪表板下的保险丝盒。

Let me check the fuse box under the ashboard.

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他的自行车用辘轳挂在床顶的天花板下。

Over the bed, hoisted by a tackle to the ceiling, was his bicycle.

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