只有三月初到四月底以及九月初到十月底的这两段时间才适合登山，就算在这两段时间里，也不超过20天是好天气。
Only the periods between early March and late May, along with early September and late October are fit for climbing, among which less than 20 days are actually fine.
九月有三十天，四月、六月、十一月；其余的有三十一天，除了二月，反正它是个糊涂的月份。
Thirty days hath September, April, June and November. All the rest have 31 except... February, and it's a silly month anyway...
在这样的一天里，九月或十月，瓦尔登是森林的一面十全十美的明镜，它四面用石子镶边，我看它们是珍贵而稀世的。
In such a day, in September or October, Walden is a perfect forest mirror, set round with stones as precious to my eye as if fewer or rarer.
在这样的一天里，九月或十月，瓦尔登是森林的一面十全十美的明镜，它四面用石子镶边，我看它们是珍贵而稀世的。
In such a day, in September or October, Walden is a perfect forest mirror, set round with stones as precious to my eye as if fewer or rarer.
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