After picking up passengers do not move off until they are properly seated or, if permitted to stand, are able to grasp a secure handrail or hand hold.是什么意思_After picking up passengers do not move off until they are properly seated or, if permitted to stand, are able to grasp a secure handrail or hand hold.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句