381. It was found that three times as much rain fell to the ground from seeded single clouds as from unseeded clouds. 人们发现从播撒过的单个云中降落到地面的雨量，是从未经播撒云中降落下来的3倍。 382. Such soil can improve conductivity over threefold. 这种土壤可使导热率提高到3倍（提高2倍）以上。 383. If the speed is doubled, keeping the radius constant, the centripetal force becomes four times as great. 如果半径不变，速度增大1倍，则向心力增大为原来的4倍（增大了3倍）。 384. Over the range of air temperature, the saturation vapor pressure fluctuates from less than 1/10 to over 100 millibars, or by a factor of 1000. 在气温变化范围内，饱和水汽压在小于1毫巴到超过100毫巴（即大于1000倍）间变动。 385. The advantage of the present scheme lies in a fivefold reduction in manpower. 这一方案的优点在于减少人力4/5（即减少到1/5）。 386. If the distance between two objects is shortened twice, then the gravitational pull grows by a factor of 4. 如果两物体间距离缩小一半（减小到原来的1/2），则其间万有引力增大到4倍（增大3倍）。 387. Had we chosen D=2km as used in the data analysis in this study, the growth rate would have been a factor 2 smaller. 如果当时选取象用于本文的资料中的那样D=2公里，则生长率就会小一半。 388. Often the distance between the rows is about twice their height. （积云）云间距离通常大约是条云本身高度的2倍。 389. A medium-thick shelterbelt can reduce wind velocity by more than 10 percent to a distance of 20 times the tree height on the leeward side and three times the height to the windward. 中等厚度的防风林在背风侧可在20倍于树高的距离而在迎风侧则在3倍于树高的距离上减小风速10%以上。 390. From the principle of work, the product of the resistance times its distance equals the product of the effort times its distance. 根据功的原理，阻力与距离的乘积等于作用力与距离的乘积。 391. A calorie is defined as the quantity of heat required at one atmosphere to raise the temperature of 1 gram of water through 1℃, usually from 14.5 to 15.5℃. 一卡路里定义为在一个大气压力条件下，使一克水温度增加1℃所需要的热量，通常是指从14.5℃提高到15.5℃。 392. The number of upper-air stations had been increased to 138 by the fall of 1980 over the area. 这一地区高空站的数量至1980年秋已增加到138个。 393. It may be quite useful to know that although a new algorithm is not optimal, it is within 12.3% of optimal at worst and 4.7% on average. 虽然新的算法不是最佳的，但它在最坏的情况下离最优值只差12.3%，平均只差4.7%，知道这一点也许很有用。 394. The standard meter fulfilled its duty perfectly, although its length has been found much later too short by 0.23mm with respect with the meridian. 标准米在应用上十分成功，虽然很晚时候人们才发现其长度比经线短了0.23毫米。 395. In the sea water sampled the salinity is two parts per thousand. 在取样的海水中，盐度为千分之二。 396. Neon, a rare gas in the air, takes only fractional percentage point of the volume. 氖是空气中的稀有气体，只占空气体积的千分之几。 397. In a infinite and empty space the geomagnetic field falls off in strength with the third power of distance. 在无限和真空的空间中，地磁场在强度上随距离3次方而衰减。 398. The measured time is rounded to the nearest whole minute. 测量的时间取整数到最近的分。 399. Although the earth, nearly 93,000,000 miles distant, intercepts less than 1/2,000,000,000 part of the solar output, this fraction amounts continuously to 23,000,000,000,000 horsepower. 虽然地球离太阳接近93,000,000英里，截获到的只是太阳放射的能量的1/2,000,000,000，但这一小部分始终有23,000,000,000,000马力。 400. In this case latent heating and radiation cooling are comparable. 在这种场合，潜热加热和辐射冷却数值相当。
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