用作定语
▲～+n.
The external door was wide open but the inner one was locked.外面的门大开着,而里面的门锁着。
The external layer of skin is called the epidermis.皮肤的外层叫表皮。
This medicine is for external use, not to swallow.这药外用,不可口服。
The external features of the building are very attractive.这座建筑物的外观是很吸引人的。
He is actually very shy, despite external appearances.他实际上很害羞,尽管从外表看他并非这样。
The internal affairs of any state, whether it's big or small, do not allow of external interference.国家虽有大小,但它的内政是不容许外国干涉的。
That is an external reason only.那只是客观原因。
用作表语
▲S+be+～+prep.-phrase
The engine is external to the boat.发动机在船舷之外。
