“痕量”常见的英文表达是 “trace amount” 或 “trace quantity”,也可用 “trace” 作形容词表示“痕量的;微量的” 。例如:
There is a trace amount of mercury in this water sample.(这个水样中含有痕量的汞。 )
The soil contains trace elements necessary for plant growth.(土壤中含有植物生长所必需的微量元素。 )