If the section is permissive, entry must become possible following a halt when the danger point can be crossed without danger even though the section is still occupied.是什么意思_If the section is permissive, entry must become possible following a halt when the danger point can be crossed without danger even though the section is still occupied.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句