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

Birthday the unexpected gift from you really make me happy, do you remember I really warm heart, I really appreciate your hearts.

生日那天收到你的意外之礼真让我欣喜万分，你记得我真让人暖心，我打心眼里感激你的一片心意。

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