| 单词 | keyhole |
| 释义 | Word Frequency keyhole(ˈkiːˌhəʊl) noun 1. an aperture in a door or a lock case through which a key may be passed to engage the lock mechanism 2. any small aperture resembling a keyhole in shape or function 3. a transient column of vapour or plasma formed during the welding or cutting of materials, using high energy beams, such as lasers |
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