水闸用门关住的水道的一部分，如运河。其中通过升高或降低这部分的水位可以抬升或压低运输中的船只 A section of a waterway, such as a canal, closed off with gates, in which vessels in transit are raised or lowered by raising or lowering the water level of that section.
这辆自行车没闸--你要骑可太危险了。 The bicycle has no brakes you ride it at your peril.
水流经水闸时十分湍急。 Water went rushing through the lock gates.
他们打开水库的闸门。 They open the sluice gates of reservoir.