把我们从只有烟囱才暖和的房间里的床上叫起来，穿上冰冷的袜子和结了霜的靴子，去挤牛奶，这是有军纪的。
It required military discipline to get us out of bed in a chamber warmed only by the stovepipe, to draw on icy socks and frosty boots and go to milking cows.
只有人们把防晒霜涂得很厚时，15倍的防晒系数才能够起到全天保护的作用。
Factor 15 offers all-day protection only if it is applied thickly.
防晒系数为60的防晒霜可能会比防晒系数只有30的要好，但这也没有必要，而且防晒系数为60的防晒产品所达到的效果并不是防晒系数为30的两倍。
A sunscreen with an SPF of 60 might be better than one with an SPF of 30, but not necessarily - and the SPF 60 product isn't likely to be twice as effective as the SPF 30 product.
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