毖 bì : careful; prevent

Big5: , Unicode: 6bd6 (毖),
Links: MT, Cantonese, Ld, Chinese Language

避 免 bì miǎn : to avert; to prevent; to avoid; to refrain from

避 暑 bì shǔ : be away for the summer holidays; spend a holiday at a summer resort; prevent sunstroke

曾 «曽» céng : (refers to something that happened previously); already; at some time in the past; before; once

Big5: , Unicode: 66fe (曾),
Links: MT, Cantonese, Ld, Chinese Language

曾 經 céng jīng : (refers to something that happened previously); once; at one time

從 前 cóng qián : previously; formerly

杜 dù : (surname); fabricate; restrict; to prevent

Big5: , Unicode: 675c (杜),
Links: MT, Cantonese, Ld, Chinese Language

防 止 fáng zhǐ : to prevent; to guard against; to take precautions

防 治 fáng zhì : (prevention and) cure

改 口 gǎi kǒu : to correct oneself; to withdraw or modify one's previous remark

過 去 guò qu : (in the) past; former; previous; to go over; to pass by

回 歸 huí guī : to return (to previous condition); Hong Kong's return to Chinese sovereignty; to regress

流 行 liú xíng : popular; fashionable; prevalent

免 除 miǎn chú : to prevent; to avoid

前 qián : before; in front; ago; former; previous; earlier; front

Big5: , Unicode: 524d (前),
Links: MT, Cantonese, Ld, Chinese Language

卻 病 què bìng : to prevent or treat a disease

上 «丄» shàng : on; on top; upon; first (of two parts); previous or last (week, etc.); upper; higher; above; previous; to climb; to go into; above; to go up

Big5: , Unicode: 4e0a (上),
Links: MT, Cantonese, Ld, Chinese Language

上 個 shàng gè : first (of two parts); previous or last (week, etc.)

上 星 期 shàng xīng qī : last week; previous week

四 年 前 sì nián qián : four years previously

往 «徃» wǎng : to go (in a direction); past; previous; towards

Big5: , Unicode: 5f80 (往),
Links: MT, Cantonese, Ld, Chinese Language

往 年 wǎng nián : in former years; in previous years

昔 年 xī nián : former years; previous years

先 前 xiān qián : before; previously

以 來 yǐ lái : since (a previous event)

以 前 yǐ qián : before; formerly; previous

意 想 不 到 yì xiǎng bù dào : unexpected; previously unimagined

預 防 yù fáng : to prevent; to take precautions against; to protect; to guard against

早 先 zǎo xiān : previously; before

則 [则] zé : (expresses contrast with a previous sentence or clause); standard; norm; rule; to imitate; to follow; then; principle

Big5: , Unicode: 5247 (則),
Links: MT, Cantonese, Ld, Chinese Language

戰 勝 zhàn shèng : prevail; surmount

直 通 車 zhí tōng chē : "through train" (refers to the idea of retaining previous legislature after transition to Chinese rule in Hong Kong or Macao)

阻 止 zǔ zhǐ : to prevent; to block