In the spring, surviving monarchs fly north, stopping at fields of milkweed to lay eggs. Succeeding generationscontinue the northward migration until the cycle starts over in the fall.是什么意思_In the spring, surviving monarchs fly north, stopping at fields of milkweed to lay eggs. Succeeding generationscontinue the northward migration until the cycle starts over in the fall.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句