三三两两在中文中是一个成语，意思是三个两个地在一起，形容人数不多。翻译成英语“twos and threes”。
1）用“by twos and threes”表示三三两两。如：
They left by twos and threes.
他们三三两两的离开了。
The students are coming into the classroom by twos and threes.
学生们正三三两两地走进教室。
2）用“in twos and threes”表示三三两两。如：
People began to leave the meeting in twos and threes.
人们开始三三两两地离开了会场。
Applications for the job are coming in slowly in twos and threes.
申请这份工作的信件三三两两来得很慢。
They went to the theatre in twos and threes.
他们三三两两地来到了剧院。