例如，90年代以来，办公用的厚且硬键盘键已经被给薄而软触摸版本所取代。

For instance, in offices since the '90s, thick keyboards with stiff keys have given way to thinner, softer-touch versions.

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认为这些平面氢键可以通过进一步键合来形成硬段微区中的三维氢键。

Three dimensional hydrogen bonding in hard segment domains can be formed by further bonding of the above planar hydrogen bondings.

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B1101 吧哈美国-F键，.468“内腔，锥形转片和轴承，透明亮漆，吧哈336-11吹口，7514C豪华硬箱子，选配降E可调音调滑块。

B1101 Bach USA - Key of F, . 468" bore, tapered rotors and bearings, clear lacquer, Bach 336-11 mouthpiece, 7514C deluxe hardshell case. Optional Eb tuning slide available".

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They are all bound, hard and brittle.

电子都成键，牢固而硬脆。

麻省理工公开课 - 固态化学导论课程节选