A very large proportion of the world's sedimentary cover is composed of ancient deltaic deposits . 世界上的沉积盖层有很大一部分是由古代三角州沉积所组成的。
We have found by experience that distance can be measured in another fashion: by triangulation . 我们曾经凭经验发现可以用另一种方式来测量距离：即用三角法。
When the fibres are in contact, the resin will form a tricorne-a triangle with curved sides . 在纤维互相接触时，树脂就形成一个曲边三角体--一个带有曲边的三角形。
More than half a century has elapsed since the performance of three kinds of triangulations all over japan . 自从在全日本进行这三种三角测量以来，已过了半个多世纪。
The best squadron in each wing won a yellow pennant on a pole that was utterly worthless . 各联队名列第一的中队都获得一面挂在旗杆上的黄色三角旗，这玩意一点价值也没有。
only a large triangle could possibly reveal any significant departure from an angle sum of 180°. 只有在大的三角形中才可能显示出180与三角和有任何差距。
In the midst of his bewilderment, the man in the cocked hat demanded who he was, and what his name was . 正在他觉得糊里糊涂的时候，那个戴三角帽的人又来问他是谁，叫什么名字。
The delta-winged columbia, before reaching the orbit, jettisoned its dual booster rockets two minutes into flight . 三角翼的哥伦比亚号航天飞机在进入轨道前，起飞两分钟就抛下其两个助推火箭。
Until about 1450 spherical trigonometry consisted of loose rules based on greek, hindu and arabic versions . 差不多直到1450年球面三角的内容由一些不严谨的法则组成，这此法则的基础是希腊、印度和阿拉伯译本。
For every large time intervals and for stars near to the pole, it is necessary, however, to use the exact formulae of spherical trignometry . 对于很长的时间间隔和靠近极星的恒星，必须使用精确的球面三角公式。
