微量元素

trace element (chemistry)

surname Wei / ancient Chinese state near present day Chongqing / Taiwan pr. [Wei2]

tiny / miniature / slightly / profound / abtruse / to decline / one millionth part of / micro- / Taiwan pr. [wei2]

a smidgen / minute / micro- / trace (element)

to measure

capacity / quantity / amount / to estimate / abbr. for 量詞|量词[liang4 ci2], classifier (in Chinese grammar) / measure word

surname Yuan / the Yuan or Mongol dynasty (1279-1368)

currency unit (esp. Chinese yuan) / first / original / primary / fundamental / constituent / part / era (of a reign) / meta- (prefix) / (math.) argument / variable / (Tw) (geology) eon

element / element of a set / chemical element

element (key component of sth) / (chemistry) element / (math.) element (member of a set)

raw silk / white / plain, unadorned / vegetarian (food) / essence / nature / element / constituent / usually / always / ever