once; already; former; previously; ever; (past tense marker used before verb or clause)[cedict]
感染
gǎn rǎnㄍㄢˇ ㄖㄢˇ
infection; to infect; to influence[cedict]
过
guòㄍㄨㄛˋ
(experienced action marker); to cross; to go over; to pass (time); to celebrate (a holiday); to live; to get along; excessively; too-; surname Guo[cedict]
某
mǒuㄇㄡˇ
some; a certain; sb or sth indefinite; such-and-such[cedict]
(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
好几
hǎo jǐㄏㄠˇ ㄐㄧˇ
several; quite a few[cedict]
年内
nián nèiㄋㄧㄢˊ ㄋㄟˋ
during the current year[cedict]
都会
dū huìㄉㄨ ㄏㄨㄟˋ
society; community; city; metropolis[cedict]
产生
chǎn shēngㄔㄢˇ ㄕㄥ
to arise; to come into being; to come about; to give rise to; to bring into being; to bring about; to produce; to engender; to generate; to appear; appearance; emergence; generation; production; yield[cedict]