名词
中文翻译：向下的井筒
同义词：
['down-hole shaft', 'down-hole shafting']
例句：
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1.The engineers were working on the downward shaft when they heard a loud noise.
工程师们在向下的井筒工作时，听到了一声巨响。
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2. The workers had to work in the downward shaft due to the heavy rain.
由于大雨，工人们不得不在向下的井筒里工作。
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3.The downward shaft was filled with water and the workers had to wait for it to drain before continuing their work.
向下的井筒被水填满了，工人们不得不等待它排空后才能继续他们的工作。