词组、短语、俚语及习惯用语• Three removes are as bad as a fire.
三次搬家犹如一次失火。• three R's
（儿童教育的基础）读，写，算。• three blue beans in a blue bladder
喧闹而无用的话。• three blue beans in one blue bladder
喧闹而无用的话。• three body problem
三体问题。• three carbon rearrangement
三碳重排。• three character primer
三字经。• three cubed
三次方的。• three dimension copy miller
立体仿形铣床。• three dimensional fabric
三维织物。
three-toed woodpecker
three-toed-woodpecker的词性：
n.（名词）
1. Either of two woodpeckers (Picoides arcticus or P. tridactylus) of northern North America, lacking the inner hind toe on each foot.
三趾啄木鸟：北美北部每只脚均缺内趾的两种啄木鸟（黑背啄木鸟 或 三趾啄木鸟） 之一
