Using fly ash as a tracer overcomes the limitation that the 137cs tracer method has in explaining the processes of soil redistribution prior to a nuclear explosion in the atmosphere.

燃煤飞灰(以下简称飞灰)作为时间标记物克服了放射性同位素137cs示踪方法不能鉴定大气核爆炸之前的土壤再分布过程这一缺陷。

youdao

Which would you rather have: A rich doctor who, prior to an operation, asks you to agree to a limitation of liability?

FORBES: Actuarial Limitations of Liability? (LOL) Laugh Out Loud! (December 1, 2002 )