Decay series
[化] 衰变系; 放射系
🧩 词语组成解析
🗣️ 情景例句
He ran the drugstore
他经营药房
There is a mole under the ground.
地下有一只鼹鼠。
and the search for oil has done more to improve deep drilling than any other mining activity.
寻找石油比其他任何采矿业对改进深孔钻探作的贡献都要大。