If made of loose earth, it will weigh little; if stones are taken with it, it will weigh more; while, if metals were put in, it would, according to the kind of metal you take, weigh still more.
如果小球是用松散的泥土做成，它的分量就小一些；如果是用石头，就会重一些；如果用的是金属材料，那么它就会更重，其重量取决于所用金属的质量。
But the harder you work at it, the more satisfied you will be with your progress, and the more appreciative of the change you've made.
但是过程越艰难，得到的满足就越多，你也会越珍惜随之发生的改变。
But with dist=each, it does something more sophisticated; it will make sure that each test gets run on each of the different testing environments that you have made available to py.test.
但是，在使用 dist=each 时，它的做法就比较复杂了；它确保每个测试在 py.test 可用的每个测试环境中运行。
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