v.排泄；分泌
It is a tribute to the capacity of the kidneys to excrete alkali. 这对肾脏排碱功能是个负担。
One of the original bugs had undergone a mutation that caused it to excrete acetate, an organic chemical. 其中一个初始的细菌经历了一次变异，分泌出了一种有机化学物质乙酸酯。
