动词短语
中文翻译：外部螺纹连接
同义词：
['externally threaded']
例句：
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1.The screw was externally threaded, so it could be unscrewed easily.
螺丝是外部螺纹的，所以很容易拧开。
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2. The bolt was externally threaded, which made it easy to install the door.
螺栓是外部螺纹的，这使得安装门变得容易。
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3. The pipe was externally threaded, which made it easy to connect to other pipes.
管道是外部螺纹的，这使得与其他管道连接变得容易。