His book presents the subject in a small compass.
他的书在小的范围中论述这题目。
"Heaven helps those who help themselves" is a well-tried maxim, embodying in a small compass the results of vast human experience.
“自助者，天助之。” 是一句久经考验的至理名言，无数人们的经验结晶体现在这小小的指路罗盘之上。
In the experiment, the compass detected magnetic fields with a strength between 0.1 gauss, which is less than the Earth's magnetic field, and 200 gauss, which is stronger than a small iron magnet.
在试验中，罗盘探测到的磁场强度范围从低于地球磁场的0.1高斯到高于一小块磁铁的200高斯。
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