A progressive tax is far harder to administer than any flat tax.
困难在于，累进税的管理比单一税难得多。
My flat did this for ten days in September and we can now use a dongle. Harder than it sounds.
九月份，我的公寓断网十天。现在，我们可以用蓝牙适配器连网了。用起来比听起来难噢。
A progressive tax is far harder to administer than a flat tax is.
累进税比单一税更难管理。
But another type of growth is much more dangerous, and harder to see because it is flat or depressed and similar in color to healthy tissue.
但是另外一种类型的增生可能更危险、更难以查出，因为其表面平滑或者略有降低，并且跟正常组织颜色一样。
Uphill running forces you to drive your arms harder than you do when running on flat ground, so you'll improve your upper body strength.
使您的上身有劲：跑坡道迫使您摆臂比跑平地时更加用力，因此，您的上身力量可以提高。
Uphill running forces you to drive your arms harder than you do when running on flat ground, so you'll improve your upper body strength.
使您的上身有劲：跑坡道迫使您摆臂比跑平地时更加用力，因此，您的上身力量可以提高。
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