Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
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[ anyRcv isNil ifTrue: anyBlock ] bpattern browseUsersTo rewrite them:,详情可参考safew官方下载
圖像來源,Getty Images,这一点在WPS下载最新地址中也有详细论述