a的用法例句

A schoolgirl rushed into a burning apartment to save a man's life.

一名女学童冲进一栋着火的`公寓去救一个男子的命。

A personal diet plan is devised after a consultation with a nutritionist.

经向营养师作咨询后，一份个人饮食方案设计出来了。

A lion is a dangerous animal.

狮子是猛兽。

As a teacher, he's a disaster.

他当老师压根儿就不称职。