n.(调节管道流量的)旋塞，活栓

原形：stopcock复数：stopcocks

The plumber turned off the water supply using the stopcock before fixing the pipe.
管道工在修理管道前使用了止水阀关闭了水源。
In case of an emergency, make sure you know where the main stopcock is located.
万一发生紧急情况，确保你知道主止水阀的位置在哪里。
The laboratory technician closed the stopcock to prevent any further flow of gas into the experiment.
实验室技术员关闭了止水阀以防止进一步有气体流入实验中。
We need to replace the old rusty stopcock as it's no longer functioning properly.
我们需要更换旧的生锈的止水阀，因为它已经无法正常工作了。
Always turn off the stopcock when leaving home for an extended period to avoid potential leaks.
在长时间离家外出时，一定要关掉止水阀，以防可能发生的泄漏。
After bleeding the radiator, remember to reopen the stopcock to allow the system to refill.
给散热器放气后，记得重新打开止水阀让系统重新注满。
The plumber installed a new stopcock valve in order to isolate the hot and cold water supplies.
管道工安装了一个新的止水阀以便隔离冷热水供应。
To drain the bathtub, first locate and open the stopcock at the bottom of the tub.
要排空浴缸，请首先找到并打开浴缸底部的止水阀。
Regularly check your stopcock for signs of wear and tear, and apply lubricant if necessary.
定期检查你的止水阀是否有磨损迹象，必要时涂抹润滑剂。
Upon discovering a burst pipe, act quickly to shut off the nearest stopcock to minimize water damage.
发现水管爆裂时，迅速关闭最近的止水阀以尽量减少水损。