铅可以在体内积聚直至到达有毒的程度。
Lead can accumulate in the body until toxic levels are reached.
在这种情况下，抽取囊内积液会缓解症状。
In that case, draining the fluid from a breast cyst can ease your symptoms.
党内积极分子中中产阶级下层出身的很多。
Party activists with lower middle class pedigrees are numerous.
党内积极分子中中产阶级下层出身的很多。
Party activists with lower middle class pedigrees are numerous.
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