To be rude to the old is not proper.

对老是不适当的。

It's not proper to patch the roof with nailsick boards.

用多次钉过钉而不结实的木板修补屋顶是不适当的。

"The general mistimed the attack, which should have been made an hour earlier."

"将军在不适当的时间发起了进攻,一小时前他就该这样做了。"

He tried to exercise an undue influence upon his colleagues.

他想对他的同事施加不适当的影响。

If the emitter ledge is too thick, current will flow through the undepleted ledge, which increases the emitter-size effect.

不适当的射极突出部厚度，将会在射极突出部侧壁造成严重的表。