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.
救援人员称，作为备用他们将会重新开钻另一口竖井，以防第一口竖井出现问题。 - 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.
轴承散发出的猛烈的热浪又将他推出海面，随后他又被涡流吸入，而再一次地被一艘翻转的救生艇带了上来。 返回 back-up shaft