■ means

单复数同形。

• a means of storing power储存能量的办法
• means of production生产资料。

• not所否定的范围
• novel
• now
• no 与 not
• no 与 yes
• number
• oats
• object
• objet d'art
• obligation
• obligation 与 duty
• obscene
• occupy
• occur
• of
• of
• of a
• of all
• off
• offend
• offer
• office
• off of
• of itself
• of one's