HSK 6
则
zé连（助）
(literary) (conjunction used to express contrast with a previous clause) but; then; (bound form) standard; norm; (bound form) principle; (literary) to imitate; to follow
晴天游客很多雨天则较安静。
Qíng tiān yóu kè hěn duō yǔ tiān zé jiào ān jìng.
There are many visitors on sunny days, whereas rainy days are quieter.
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Appears across levels (6（7-9）) in the HSK 3.0 word list.