啊，哈顿先生，我明白了！”赫伯特大声说。“小棍子和木杆之间的距离比小棍子和峭壁底部之间的距离，就等于木杆的高度比峭壁的高度。”
“you remember what are the properties of two similar triangles?“
“yes，“ replied herbert;“their homologous sides are proportional.“
“well， my boy， i have just constructed two similar right-angled triangles; the first， the smallest， has for its sides the perpendicular pole， the distance which separates the little stick from the foot of the pole and my visual ray for hypothenuse; the second has for its sides the perpendicular cliff， the height of which we wish to measure， the distance which separates the little stick from the bottom of the cliff， and my visual ray also fo
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