a stumbling block
n.绊脚石
热门单词
- a flock of
- a horse of different color
- abrogate
- absolute location
- absolute sovereignty
- abstriction
- academese
- academic research
- acceleration resistance
- acceptance gauge
- accessorily
- accidental spillage
- accord
- acerb
- acetonyl acetone
- acetylene chloride
- acetylene starter
- acetylthiohydantoin
- acid bath
- acid rosin size
- acidproof
