So this is where the concentration of B is roughly constant over time.
那么这是B的浓度，粗略地随时间变化保持常量。
In response to the appearance of such variants in the cell population the concentration of the toxic chemical in the growth medium is increased, thus keeping the selection pressure constant.
为应对细胞污染中出现的变异，有毒物质的浓度是逐步增加的，以此保证筛选力度的稳定。
Now, scientists report that they've created a contact lens that can deliver a high concentration of antibiotic at a constant rate for more than 30 days.
目前，科学家报告称他们已经创造出了一种隐形镜片，它能以固定速度持续释放高浓度抗生素超过30天。
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