He had a sudden sinking feeling in the pit of his stomach.

他内心深处突然有一种不祥之感。

《牛津词典》

This text introduced the practice method of the box permanent steel petroleum derrick shaft sinking in the construction of vertical shaft pit shaft.

在立井井筒建设中，我们在原设计的基础上，对箱形永久钢井架凿井的实际方法作了改进。

youdao

Your stomach sinks, you have that sinking feeling in the pit of your stomach, when you get a bad grade on a test.

当你考试考砸的时候,你的胃会垂下去,或者说,会有胃部下垂的感觉

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