Progress in this area can be measured by the difference in weight between buildings built now and those of comparable size built one hundred years ago.

通过现在修建的建筑物和在一百年前修建的具有相同规模的建筑物在重量上的差异，我们可以衡量出这一领域的进步。

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Rossy had never flown for longer than ten minutes and had to calibrate his equipment and weight to perfection since even the addition of a few hundred grammes would have affected his flying ability.

此前罗西试飞时的时间从未超过十分钟，所以在这次飞行前他必须将机翼和体重都调整到最佳状态，因为即便增加几百克的重量都会影响他的飞行。

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The finished plane weighed just nine hundred kilograms, about the weight of a small car.

完工的飞机仅重900千克，仅仅相当于一辆小汽车的重量。

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