用法:
1 (pl vols) volume:
an edition in 3 vols 三卷本的版本 *
Complete Works of Byron Vol 2 《拜伦全集》第2卷.

用法:
2 volume:
vol 125ml, eg on a container 容量125毫升（如容器上的标记）.

• understand
• understandable
• understandably
• understanding 1
• understate
• understatement
• understudy 1
• undertake
• undertaker
• undertaking 1
• undertone
• undertow
• undervalue
• underwater 1
• underwear
• underweight
• underwent
• underworld
• underwrite
• underwriter
• undeserved
• undeservedly
• undesirable 1
• undesirably
• undeterred