sluice gate
entrance
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sluice gate
lock gate
工人 打開 了 閘門。
The worker opened the sluice gate.
大雨 過後， 閘門 被 關上 了。
After the heavy rain, the sluice gate was closed.
閘門 控制 水流 的 速度。
The sluice gate controls the flow speed of water.