At each "way station," the compound must resist the acids of digestive juices, jump membrane barriers or fend off enzymes designed to chop it into useless bits.
每到一个“关卡”，药物就必须抵抗消化液的酸侵蚀，或必须穿越膜障碍，或必须避开专门将药物砍成无用碎片的酵素。
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