闸口释义：闸门开时水流通过的孔道。
此事件可以绑定到闸口门打开、动作传感器触发或闸口门管理人员触发的其他输入。
This event could be tied to the opening of a dock door, the triggering of a motion sensor, or by some other input triggered by a dock door attendant.
有官员表示两周前，在电网和密歇根湖附近的一处闸口之间，已发现亚洲鲤鱼的DNA。
Officials said two weeks ago that DNA from Asian carp had been found between the barrier and a lock near the lake.
闸口往往会聚集许多小鱼。
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