在过去的200万年里，寒冷的冰期与较暖和的间冰期交替出现。
Over the past two million years, colder glacial periods have alternated with warmer interglacial periods.
内吸性杀菌剂与保护性杀菌剂交替使用可以延缓抗药性的出现。
Alternate use of systemic and protectant fungicides may delay the onset of resistance.
形成Z-DNA通常需要一段交替出现的胞嘧啶与鸟嘌呤碱基。
To make Z-DNA typically requires a stretch of alternating cytosine and guanine bases.
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