该实验室设计，试验和鉴定了一种轻巧、低当量的裂变装置。
The laboratory has designed, tested and evaluated a lightweigth. low-yeild fission device.
在过去的三个星期中，你已经学习了蔬菜水果、全麦谷物和低脂奶制品是怎样填满你的盘子，使你既能摄取相当量的优质营养素而又不会含有太多的热量的。
In the past three weeks, you have learned how vegetables, fruit, whole grains, and low-fat dairy can help you fill your plate with quality nutrients that don't pack a lot of calories.
但步进电机的效率低，拖动负载的能力不大，脉冲当量不能太大，调速范围不大。
But the step motor efficiency is low, the ability is not big, load drag pulse equivalent cannot too big, speed range is not big.
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