Fragility - When you make a change, unexpected parts of the system break.

脆弱-当你做出一个修改，系统中意想不到的某部分将会崩溃。

youdao

Make sure you add them to a clean container, and use a separate dropper pipette for each raw oil, otherwise you will mix them in unexpected ways.

一定要把它们加到一个干净的容器里，然后每种精油原料都各用一支滴管来吸取，否则的话，你就用其它非常规的方法来混合它们。

youdao

Whatever plans you make, there is always something unexpected that will interfere with them.

不管你的计划是什么，总有意想不到的事情来干扰它们。

youdao

He suggested packing almost nothing, and buying what you need along the way to make travelling more unexpected and fun.

BBC: Packing secrets from savvy travellers