back-up shaft
常见例句
- Rescuers said they would resume drilling a separate shaft as a back-up plan in case of problems with the first one.
救援人員稱，作爲備用他們將會重新開鑽另一口竪井，以防第一口竪井出現問題。 - A blast of hot air from the shaft then blew Lightoller back to the surface of the water. He was pulled under again, this time resurfacing by a up-turned lifeboat.
軸承散發出的猛烈的熱浪又將他推出海麪，隨後他又被渦流吸入，而再一次地被一艘繙轉的救生艇帶了上來。 返回 back-up shaft