Preparation of Activated Carbon from Bamboo Sawdust by Twostep Activation.
两步法制备竹质活性炭
The students are coming into the classroom by twos and threes.
学生们正三三两两地走进教室。
He could count by twos.
他已经学会数奇偶数了。
Franklin could count by twos, and tie his shoes.
富兰克林已经学会奇偶数了, 他还学会了自己系鞋带。
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