名词
中文翻译：正常连接
同义词：
['normal connection', 'normal fastening']
例句：
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1. The engineers were discussing the best way to install the new piping system.
工程师们正在讨论安装新管道系统的最佳方法。
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2. The bolts holding the door together are securely tightened.
用来固定门的螺栓已经牢固地拧紧了。
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3. During normal operation, the machine should operate smoothly without any abnormal noises.
在正常工作时，机器应该平稳运行，没有异常噪音。