externally的翻译

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横膈膜的英文：the diaphragm参考例句：The diaphragm draws air into the lungs.横膈膜向下运动让空气进入肺部.Beneath the handwheel is a hexheaded externally-threaded diaphragm-retaining nut.手轮下面是一个六角形外螺纹横膈膜止