1 PHRASAL VERB-ERG (使)返回;(使)折回 If you turn back or if someone turns you back when you are going somewhere, you change direction and go towards where you started from. (使)返回;(使)折回 [Also VERB n PREPOSITION]
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She turned back towards the crossroads. [VERB PREP. prep./adv.]
她折回十字路口。
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They were very nearly forced to turn back. [VERB PREP.]
他们差点被迫返回。
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Police attempted to turn back protesters marching towards the offices of President Ershad. [VERB PREP. noun]
警方试图迫使向艾尔沙德总统官邸进发的抗议者原路返回。
SYN go back, return, retreat, retrace your steps
2 PHRASAL VERB 无法改变计划;无法收回成命 If you cannot turn back, you cannot change your plans and decide not to do something, because the action you have already taken makes it impossible. 无法改变计划;无法收回成命