... up-and-down indicator ==> 紧松指示器,松紧指示器,走时指示器 up-and-down locks ==> 安全锁 up-and-down maneuver ==> 升降机动 ...
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The Erie required 83 locks, each made of stone, to move boats up and down the natural elevations. The locks were designed so that each needed only one person for its operation.
运河共有83个船闸，每一个都采用石材建造，以用于提升或降低船只的航道高度，这些船闸的设计要保证只需要一个人就能进行操作。
Your body locks up almost instantly, you go down to the ground with inappreciable damage, and you are no longer a threat to anyone.
你的身体几乎立即锁定，你去下到地面与微不足道的损害，你不再是任何人构成威胁。
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