sluice gate
entrance
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sluice gate
lock gate
工人 打开 了 闸门。
The worker opened the sluice gate.
大雨 过后, 闸门 被 关上 了。
After the heavy rain, the sluice gate was closed.
闸门 控制 水流 的 速度。
The sluice gate controls the flow speed of water.