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INTERMEDIATE LEVEL
Content
to shift the carrying pole to the other shoulder ☊ 
đổi vai ☊
→ → →
like: đổi vai → →
In some cases people have had to wait several weeks for an appointment. ☊ case ☊
In many marriages there has been a complete role reversal (= change of roles) with the man staying at home and the woman going out to work. ☊ role ☊
It was not unknown for people to have to wait several hours (= it happened sometimes). ☊ unknown ☊