trace amount
... 痕迹的 vestigial 痕迹量 minor value; trace amount; trace element 痕迹论 trace theory ...
minor value
... 痕迹的 vestigial 痕迹量 minor value; trace amount; trace element 痕迹论 trace theory ...
trace element
... 痕迹的 vestigial 痕迹量 minor value; trace amount; trace element 痕迹论 trace theory ...
tracer level
... 放射化学实验室;示踪物实验室 tracer laboratory (= tracer lab) 痕迹量;示踪量 tracer level 示踪法 tracer method ...