by twos and threes 三三两两地 ; 零零星星 ; 两三个一次 ; 二三成群
in twos and threes 三三两两地
People arrived in twos and threes.
人们三三两两地到了。
《牛津词典》
We went to the station by twos and threes.
我们三三两两地走向车站。
youdao
Groups of rescuers splinter off in twos and threes.
CNN: The brotherhood of Disaster City
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