working preventer造句

When the boom is as near as possible to midships ( near to running fore-and-aft along the boat's centreline ), the working preventer is slackened, the lazy one tightened, and the mainsheet made very secure.
The course of the boat may slew further than expected, which can be ignored as it gives a shorthanded crew time to do the next three things : Run out the mainsheet as fast as possible without burning the hands, ensuring that the newly-lazy preventer runs free, then tighten in and secure the newly working preventer.
It's difficult to find working preventer in a sentence. 用working preventer造句挺难的