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阅读段落
By the mid-1960s, the situation took an alarming turn with the outbreak of four more new pests, necessitating pesticide spraying to such an extent that 50% of the financial outlay on cotton production was accounted for by pesticides. In the early 1970s, the spraying frequently reached 70 times a season as the farmers were pushed to the wall by the invasion of genetically stronger insect species.
段落大意
本段介绍了这种单调综合症发展到后期令人无法忍受的情形：每季度喷洒70次农药。
阅读笔记
Mid-1960s：50% of financial outlay on cotton productionpesticides
Early 1970s：70 times a season invasion of genetically stronger insect species
逻辑关系
1. 并列
By the mid-1960s, the situation took an alarming turn with the outbreak of four more new pests, necessitating pesticide spraying to such an extent that 50% of the financial outlay on cotton production was accounted for by pesticides.
In the early 1970s, the spraying frequently reached 70 times a season as the farmers were pushed to the wall by the invasion of genetically stronger insect species.
