Sometimes bears need even thicker skins.
有时候，卖空者的皮要厚一点。
Mars must have had a thicker atmosphere in order to support water that flowed on the surface even only sometimes.
火星一定有一个较厚的大气层来支持水在它的表演流动，哪怕只是某些时候。
A thicker swim cap (made of silicon as opposed to latex) might be preferable to keep the head warmer. Sometimes a swimming cap does not stay on very well and continually slips.
一个较薄的泳帽(由硅胶制成，而不是乳胶)可能是最好保护头部温度。
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