I think you are referring to locks;used to lower and raise water levels for ship transportation.
Locks are used to raise or lower the water level for boats where necessary on waterways. An example is the Panama Canal.
Locks
locks
locks
the flag is raised and lowered when you first walk in the flag is raised and lowered when you first walk in
an adjustable chair can be raised and lowered.
First it is raised and then it is lowered. short and simple.
Raised.
In general, the solubility of a salt increases as the temperature is raised, and thus decreases when the temperature is lowered.
The ball-and-socket joint of the shoulder allows the upper arm to be raised and lowered.
When they have been lowered.
No. A ship going through a lock gets raised or lowered several meters, without any effect on its ability to float.
A Sharp