It is well known to enthusiasts that a glass must be "beer clean" -free of any grease or skin oils, including fingerprints-to support a good head of foam.
很多热衷者都知道，要想倒出一杯漂亮的泡沫满满的啤酒，他的杯子必须做到“啤酒干净”——也就是说不能有一点儿油渍或者皮肤的油，连指纹都不能有。
In a world where the tariff was the only prior distortion, it is well-known that the sum of these effects must be positive-that is, the world as a whole gains from a tariff cut.
众所周知，如果主要干扰仅是来自关税，那么这些作用的总和必定为正——也即，削减关税会令世界整体受益。
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