With the range finder a bar with marking the several fixed distances must be affixed to the base of the tree . 使用视距器时，必须在树基部附加一根指示几种固定距离棒。
Cumulate plagioclase appears abruptly at the base of the f unit, which rests on an erosional disconformity . 堆积的斜长花岗石在位于侵蚀假整合之上的F单元的基底突然出现。
The base surge of dirt particles moves outward from the center of the explosion and is subsequently carried downwind . 由尘埃颗粒组成的基浪从爆炸中心向外移动，继而顺风散开。
Travelers in mountain regions will be familiar with the accumulations of scree which occur at the base of steep slopes . 山区中的旅行者对出现在陡坡坡底处的碎石堆是相当熟悉的。
Air was driven forcibly downwards through a round hole in the base of the machine by a 450 horse-power engine . 空气靠一台450马力的发动机通过气垫船底部的一个圆孔向下猛烈喷出。
Events of the past week had also demonstrated how precarious was the base from which our diplomacy was operating . 上周的事态发展表明我们开展外交活动所依据的基础是何等不牢固。
The lights of the hotel and the cottages became yellow dots, a cluster of glow-worms at the base of sachem mountain . 旅馆和棚屋的灯光变成了小黄点，宛如萨钦姆山脚下的一群萤火虫。
The abrupt decrease in transporting power causes a stream to drop most of its load of sediments near the base of a mountain . 搬运力的突然减小使河流在山脚附近卸下它所负载的大部分的沉积物。
If a bay is inclined to the general line of the base at an angle of 10 mm in 24m, the error will be 0. 1 ppm . 如果一个尺段偏离基线总方向的角度相应于24米距离上的10毫米，则误差为0110-6。
It stood, not distant, but unseen, almost at the base of the hill upon whose crest he waited . 它站住了，离开他并不远，可就是他看不见，因为他站在小山顶上等待着，它呢，几乎就在这小山山脚下。
