It's a pain to lug around an external keyboard, which many people will require if they're serious about banging out documents.
随身携带外置键盘是件很痛苦的事，而这对于那些要认真敲出文件的人来说是必需的。
2
The lug boss is arranged between the screw head and the screw rod, and the external circumference of the lug boss is provided with a plurality of longitudinal grooves.