every so often 偶然 ; 偶尔
Every so often, a new martial art arrives from the East.
时不时地，一种新武术从东南亚到达至此。
《柯林斯英汉双解大词典》
You're bound to mistime a tackle every so often.
你肯定会有错估进攻时机的时候。
She's going to come back every so often.
她会偶尔回来一下。
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