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1.The microneedles are either hollow or empty, like a normal hypodermic needle, or covered with a drug which breaks down in the eye.
break down 分解；发生故障；失败；毁掉；制服；破除 (障碍、偏见等) [表赞许]
Over time, the protein in the eggshell breaks down into its constituent amino acids.
随着时间的推移,蛋壳中的蛋白质分解成其构成成分氨基酸。
Women's sports are breaking down the barriers in previously male-dominated domains.
女子体育运动正在打破障碍进入一些先前由男子占主导地位的领域。
