矿工氡子体个人累积暴露量估算规范: estimation standards of personal cumulative exposure to radon decay products for miners
长期: over a long period of time; long-term; long range; secular 短语和例子作长期打算 take a long view; make long-term plans; 长期观点 a long-term view; 长期存在的问题 a long-standing problem; 这个实验结果长期不显著。 the resul