The move from elementary school to middle school or junior high can be difficult.
从小学进入中学或者初中的这种变动可能会有困难。
Police officers who marry women or men are most likely to marry elementary- and middle-school teachers.
警察官员最有可能与小学或中学老师配对。
With more advanced training, one can teach physical education on the elementary, middle-school, or high-school level.
如果具有更先进的培训，他们就可以在小学，中学或高中级的学校教体育课。
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