不可缺 indispensable
necessary
- 视镜是必不可缺的,可是它们妨碍了视线。
Glasses are, of course, an indispensable thing, but they worsen the sight. - 帽子也很时尚,也是必不可缺的,因为要员受阳光的伤害。
Hats are also very fashionable and necessary too, for protection from the sun. - 当前的无线设备最不可缺的配件是用以供能的电线。
The most ubiquitous accessory for wireless devices is the wire used to power them.
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