吸

吸烟

xī yān

to smoke

门吸

mén xī

doorstop

上呼吸道感染

shàng hū xī dào gǎn rǎn

upper respiratory tract infection

呼吸

hū xī

to breathe

中东呼吸综合征

zhōng dōng hū xī zōng hé zhēng

Middle East respiratory syndrome (MERS)

二级头呼吸器

èr jí tóu hū xī qì

(scuba diving) regulator; demand valve

人工呼吸

rén gōng hū xī

artificial respiration (medicine)

静脉吸毒

jìng mài xī dú

intravenous drug

倒吸一口凉气

dào xī yī kǒu liáng qì

to gasp (with amazement or shock etc)

备用二级头呼吸器

bèi yòng èr jí tóu hū xī qì

(scuba diving) backup regulator; octopus

口吸盘

kǒu xī pán

oral sucker (e.g. on bloodsucking parasite)

同类相吸

tóng lèi xiāng xī

Like attracts like.