■ mutual

本来是“互相”的意思。

• mutual aid互助。

但是意义扩大到“共同”。

• mutual fund共同基金（美国的一种投资方式）
• mutual friend共同的朋友
• mutual hobby共同的爱好
• mutual effort共同努力
• We have a mutual interest in opera.咱们都对歌剧感兴趣。

• sole 与 only
• solitude
• solitude
• solitude 与 loneliness
• so long as
• solution
• some place
• someplace
• someplace 与 some place
• something of a
• some time
• sometime
• sometimes
• sometimes
• sometime, sometimes 与 some time
• so much as
• so much for
• soon
• sooner
• sophisticated
• sophisticated, sophistication
• sophistication
• sorry
• sorry
• sorry, but