您要查找的是不是：
- elementary tree transformation 初等树变换
- An extensible set of tree transformations to apply to expression trees. 一个应用于表达式树的，可扩展的树转化操作集。
- My son is studying at an elementary school. 我儿子在一家小学上学。
- As the car hit the tree he was snot out. 汽车扭在村上，他被猛地摔了出来。
- In the case of a highly intelligent animal, elementary training is easy. 就高度灵敏的动物而言，初级训练并不难。
- The bird sang high and clearly in the tree. 鸟儿在树上清脆地高歌。
- The annular markings on a tree indicate its age. 树的环形纹理显示其年龄。
- The car hit the tree with a sickening crash. 那辆汽车撞在树上发出让人难受的撞击声。
- An arrow whizzed past and stuck in a tree. 一支箭“飕”地一声飞过去，钉在一棵树上。
- The squirrel ran up a tree and got out of my reach. 松鼠跑到树上去了，我逮不着。
- The workers saw off a limb from the tree. 工人从树上锯下了一根大树枝。
- He is not made for climbing the tree of knowledge. 他不是生来适于攀登知识之树的。
- This elementary school is affiliated to a university. 这所小学附属于一所大学。
- He tethered his horse to a tree. 他用绳子把马拴在树上。
- The ivy twined round the oak tree. 长春藤盘绕着橡树。
- I saw the bird at the very top of the tree. 就在那棵树顶上我看到那只鸟。
- He is hit by a falling tree and killed on the spot. 一棵树倒下来，把他当场砸死了。
- She was sitting in the shade of a big olive tree. 她正坐在一棵大橄榄树的树荫下。
- In the storm I took shelter under the tree. 暴风雨时，我正在树下躲避。
- He is a self-educated man. He didn't finish even elementary school. 他是一个自学成材的人。他连小学也未读完。
