此举的作用也是阻止冷空气进入大厦的电梯井道。
The role of the move is to prevent the cold air into the building of the elevator shaft.
第一步是关紧电梯井道上方所有的排气口以及出口，防止水进入电梯井道。
The first step is to close all vents and openings at the top of the hoistway to prevent water from entering the elevator shaft.
该系统的优势在于：在同一电梯井道内安装上下两个电梯轿厢，在最小的空间内实现了最大的载重。
The key advantage of the system: The use of two elevator cabs one above the other in a single shaft maximizes capacity in the minimum amount of space.
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