| 短语 | only if |
| 释义 | ˈonly if(rather formal)used to state the only situation in which sth can happen只有Only if a teacher has given permission is a student allowed to leave the room.学生只有得到老师的许可才能离开教室。Only if the red light comes on is there any danger to employees.只有红灯闪亮时才有危及职工的险情。 |
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