Lock (water navigation)

Canal lock and lock-keeper's cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England

Lock on the River Neckar at Heidelberg in Germany

Three gorges dam lock near Yichang on Yangtze river, China

A pound lock on the Keitele-Päijänne Canal at Äänekoski in Central Finland

A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.

单词	Dock gate
释义	Dock gate 原声例句牛虻（原版） But the dock gates were closed. 但是码头大门关闭了。英语百科 Lock (water navigation) A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.
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Dock gate

Lock (water navigation)