by leaps and bounds造句

1、His math grades have improved by leaps and bounds since he got a tutor
（自从请了家教以后，他的数学成绩就突飞猛进。）

2、Swedish industrial front is developing by leaps and bounds in the late years.
瑞典的工业近年来出现了跃进的局面。

3、Doris' French improved by leaps and bounds after she got a French boyfriend.
在交了一个法籍男友之后，桃乐丝的法语进步神速。