OK, and so we repeat the process with maybe z equals two, and we get another level curve, and so on.
我们对z=2重复这个过程，就得到另外的等高线，如此种种。
It is more like a map on the scale of one foot equals two feet: you see the potholes, but you do not learn much about the scenery.
它更像一张比例尺一比二的地图：你看得到坑洞，但无法知道风景的很多信息。
Bring a travel-size container of gentle laundry detergent to wash clothes at your destination. One little packet equals two whole outfits you can leave at home.
带上一包旅行装洗衣液，这样你就可以在到达目的地后洗你的脏衣服。一小包就可以洗两身衣服。
Bring a travel-size container of gentle laundry detergent to wash clothes at your destination. One little packet equals two whole outfits you can leave at home.
带上一包旅行装洗衣液，这样你就可以在到达目的地后洗你的脏衣服。一小包就可以洗两身衣服。
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