But the aged teacher occupies the proportion is too small, cannot form the very good age echelon;

但年龄结构中青年教师所占的比例过小，不能形成很好的年龄梯队；

youdao

"Teacher Fei asked when the silence between them began to attract prying glances from the middle-aged proprietress of the diner, who sat behind the counter and studied the few occupied tables."

范老师问，他们两人之间的沉默已经开始引起饭馆中年老板娘的注意，她坐在柜台后面，打量着几张有食客的餐桌。

youdao

Our math teacher is a middle-aged man.

我们的数学老师是位中年男子。

youdao

She said their relationship had ended when she left the school to study abroad, though she had received a stream of letters from Mr Brewer signed Mat, which she said stood for "Middle Aged Teacher".

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The men described the fourth man, The Master, as a middle-aged, part-time teacher who hung around their window-and-door-making shop.

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Mr Lewis, from Carmarthenshire, had started working in the pits aged 14 but became a teacher after graduating in 1931.

BBC: Rhys Thomas Lewis