trace amount; minute quantity
Tone colorsmāmámǎmàma
Meanings
1 sense · 4 examplesnoun
trace amount; minute quantity; extremely small amount
formalA technical term in chemistry and environmental science, referring to an amount so small it's barely detectable, often measured in parts per million (ppm) or billion (ppb).
Zhè这
zhǒng种
shuǐ水
guǒ果
hán含
yǒu有
hén痕
liàng量
de的
xī硒
，
duì对
rén人
tǐ体
yǒu有
yì益
。
This fruit contains a trace amount of selenium, which is beneficial to human health.
Kē科
xué学
jiā家
zài在
yàng样
běn本
zhōng中
jiǎn检
cè测
dào到
le了
hén痕
liàng量
de的
yǒu有
dú毒
jīn金
shǔ属
。
Scientists detected trace amounts of toxic metals in the sample.
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Hén痕
liàng量
yuán元
sù素
duì对
zhí植
wù物
de的
shēng生
zhǎng长
zhì至
guān关
zhòng重
yào要
。
Trace elements are crucial for plant growth.
Fēn分
xī析
xū需
yào要
gāo高
líng灵
mǐn敏
dù度
yí仪
qì器
，
cái才
néng能
cè测
chū出
rú如
cǐ此
hén痕
liàng量
de的
wù物
zhì质
。
High-sensitivity instruments are required for the analysis to detect such minute quantities of the substance.