clearing bearing
... circular unidirectional thrust bearing环状单向推力轴承 clearing bearing安全方位 closed-type bearing密闭形轴承 ...
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安全方位角 safe azimuth
·2,447,543篇论文数据，部分数据来源于NoteExpress
或者遭遇突发情况的时候，警员、救护队或消防员的制服上会出现安全警告的提示，为附近或过路人流指示安全方位。
And at an emergency, the jacket of a police officer, ambulance crew or fire-fighter could flash warnings or directions to anyone nearby or passing.
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