放射fàng shè
to radiate, radioactive新陈代谢xīn chén dài xiè
metabolism (biology)标本biāo běn
specimen, sample根源gēn yuán
origin, root (cause)椭圆tuǒ yuán
oval, ellipse, elliptic模型mó xíng
model, mould, matrix, pattern比重bǐ zhòng
proportion, specific gravity气压qì yā
atmospheric pressure, barometric pressure