n.[化]釷（符號(hào)Th；原子序90）

Marie found another called thorium. 瑪麗發(fā)現(xiàn)了另一種物質(zhì)，叫釷。

A radioactive isotope of thorium with mass number228. 射釷釷的放射性同位，質(zhì)量數(shù)為

This is clearly confirmed by the detection of thorium. 這顯然證實(shí)了檢測釷.

They recognized that in a thorium province Pb208 would present complications. 他們承認(rèn)，含釷區(qū)內(nèi)的Pb208會(huì)產(chǎn)生干擾。

Followed by the slow decomposition of uranium to another element thorium. 鈾元素隨后緩慢分解為另一種元素釷。