in control of the southern side of the mountain.他们控制着南山坡。
2、under one's arm, in one's arms
这两个介词短语中的arm是指"胳臂"，而不是"武器"的意义。注意不得任意改变两个短语中arm和arms的单复数形式。
under one's arm意为"在某人腋下的"。例如：The man who is carrying a parcel under his arm is my elder brother.（腋下）挟着一只包裹的那个人是我哥哥。He keeps the dictionary under his arm. 他把词典挟在腋下。
in one's arms意指"（小孩或东西）被搂在怀里"。例如：The woman who is coming here has a child in her arms.往这儿来的那位妇女抱着一个孩子。He has the big dictionaries in his arms on his way to the room.在去寝室的途中他怀里抱着几本大词典。
3、under repair, in repair
这两个介词短语一般都作表语，补语或后置定语。
under repair属于表示进行意义的介词短语，有被动的含义，等于being repaired（在修理中）。例如：The department store is now under repair (= is now being repaired) and it will be reopened on May Day.百货公司正在修缮，将于五一节重新开业。The machine is under repair.那台机器正在修理。
in repair表示某物处在一种"维修良好"的状态之中，常用in good repair,其反义语为in bad repair或out of repair（失修）。例如：They |
