这些直线相互垂直吗？
要不是重力使箭掉落地上，它将会一直沿直线往前飞行。
Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.
马从一条直线出发，然后沿着对角线跳跃。
The horse starts out in a straight line and then it hops off on a diagonal.
经过八角形的中心画两条直线，能够得到六个一样的三角形。
Six identical triangles can be formed by drawing two straight lines through an octagon's center point.
在本例中，我用下面所示的代码使这条直线围绕动画的中心旋转。
In this case, I rotate the line around the center of the movie with the code shown below.
英国的科学家发现，巨型雌性龟能在一条完全的直线上游行上千英里。
British scientists have discovered that the gigantic female turtles can swim for thousands of miles in a perfectly straight line.
沿着直线写下这些单词，或者，如果有空间的话，把它们写在更多的圆圈里。
Write the words along the lines or, if you have space, write them inside more circles.
我们需要注意这个观点，即艺术的发展是在一条直线上发生的，表现形式从简单到复杂。
We need to be careful with the idea that artistic development occurs in a straight line, from simple to complex representations.
但是有趣的是，其中有一些会朝西直线移动，而另外的则会曲折前行，或者甚至绕着大圈子移动。
But some, and this is interesting, move straight west while some zigzag or even move in large circles.
如果接受了正确的训练，来自不同国家的飞行员都能理解身体信号。当你沿一条直线上下摆动手臂时，就表示“是”。
Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes".
卢布的实际购买力已直线下降。
美元直线下跌。
然后，智者拿出一张纸，在中间画了一条直线。
Then the wise man took a piece of paper and drew a straight line down the middle.
地轴是我们虚构的穿过地心的一个倾斜的直线轴。
The tilt of the earth's axis, that imaginary pole that runs through the center of the earth.
相反，随着直线下降的收入和不稳定的工作，不幸福的夫妻往往负担不起离婚。
Rather, with incomes plummeting and insecure jobs, unhappy couples often couldn't afford to divorce.
可再生能源，尤其是风能和太阳能的价格直线下降，正日益成为人们关注的焦点。
Increasingly the story is about the plummeting prices of renewables, especially wind and solar.
但是，可再生能源，尤其是风能和太阳能的价格直线下降，正日益成为人们关注的焦点。
But increasingly the story is about the plummeting prices of renewables, especially wind and solar.
人们喜欢看到垂直或水平的直线。
People like straight lines that are either vertical or horizontal.
这些红色垂直的直线代表故障。
我们马上就要学习直线的参数方程。
OK, so we are going to learn about parametric equations of lines.
这些系数构成的向量和直线平行。
And, these coefficients here correspond to a vector parallel to the line.
今天我们要从学习直线方程开始。
So, today, we'll start by looking at the equations of lines.
坐标是数字值，代表角度或直线距离。
Coordinates are numeric values, representing either angles or linear distances.
当然直线形的分子不像这样。
使用组装线模型，沟通是直线型的了。
直线式的预测往往不可靠。
实际上，直线的参数方程总是这个样子的。
In fact, parametric equations of lines always look like that.
他们随宇宙射线同时产生，但却直线运行。
踝、膝盖及髋保持在一条直线上。
踝、膝盖及髋保持在一条直线上。
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