external
单词辨析：
只作定语，指距离中心、内部较远的，或相对而言在外的。
He saw her to the outer door.
他把她送到外边门口。
I heard a voice in the outer room.
我听到外屋有人说话。
指某事物或人体外部的。
the external appearance of the church
教堂的外观
The external layer of the skin is relatively impermeable to water.
皮肤的外层相对来说不透水。
只作定语，指人或事物的外表的，但有时并非真实。
An outward show of confidence concealed her nervousness.
她表现出很有信心的样子以掩盖内心的紧张。
These houses look the same in outward view.
这些房子从外观上看是相同的。
相关例句：
You can use minification for both external and internal style sheets.
外部和内部样式表都可以缩小。
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。
It is through our nervous system that we adapt ourselves to our environment and to all external stimuli.
我们是通过神经系统使自己适应环境及所有外部刺激的。
Such events occur only when the external conditions are favorable.
这种事情只有在外部条件有利时才会发生。
The developing countries bear the burden of an enormous external debt
发展中国家背负着巨额外债。
The open cities will be testing grounds for our external policies.
使开放城市成为对外政策的窗口。