In England traffic must keep to the left.（英译中)

The heavily laden infantry, though enjoying a superiority of six－to－one, simply could not keep to schedule and lost 60000 men in one day.（英译中)

His left knee was hurt in a traffic accident.（英译中)

I like to study in the library.（英译中)

The police must do all they can to bring criminals to justice.（英译中)

You must keep your promise.（英译中)

The government must act to firm prices up.（英译中)