译文：春日的郊游，风光无限，每年到了寒食节，便是梨花盛开的时节。

Make no mistake about it: Computers process numbers - not symbols. We measure our understanding (and control) by the extent to which we can arithmetize an activity.

解释：能看清深潭中的游鱼的，不是吉祥的好事；能探知别人隐私的，定会招祸遭殃。