• 1. pit sinking: 凿井
• 2. foundation by pit sinking: 沉井基础
• 3. fight against sinking pit: 跌窝抢险

• 1.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。
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• 2.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。
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