The sea gushed forward and backward; it was a mournful sound.

海浪反复拍击着岩石，发出悲怆的声响。

There are no words for left, right, forward and backward.

里面没有所谓“左”、“右”、“前”、“后”。

It can move its fingers and turn its upper body, and walk forward and backward.

它可以移动手指并转动上半身，也能向前或向后移动。

" Palindrome! I see you're still speaking in sentences that are spelled the same forward and backward! "

“是回文！我看到你说的句子，顺读和倒读都一样！”

So this is cyclic forward and backward movements that the animals make with their whiskers.

所以这是动物用胡须做的循环前进和后退运动。

Then his thoughts became so clear that he was able to examine them forward and backward.

然后他的思想变得如此清晰，以至于他能够向前和向后检查它们。

This means that there can be no important difference between the forward and backward directions of imaginary time.

这意味着虚时间的向前和向后方向之间没有重要区别。

Yet there is a big difference between the forward and backward directions of real time in ordinary life.

然而，在日常生活中，实时的向前和向后方向有很大的不同。

To summarize, the laws of science do not distinguish between the forward and backward directions of time.

总而言之，科学定律不区分时间的向前和向后方向。

In hadrosaurs, the grinding surfaces are almost horizontal, meaning that the jaws are moving from side to side and forward and backward.

在鸭嘴龙中，磨削面几乎是水平的，这意味着颌骨会左右移动，前后移动。

And the peg-like teeth on the roof of its mouth could have broken down those bites using a forward and backward chewing motion.

它嘴巴顶部的钉状牙齿可以通过向前和向后的咀嚼动作来分解那些咬伤。

This means that there is significant forward and backward scattering in these media, making it even more difficult to create more optimized algorithms that simplify these scattering equations.

这意味着在这些媒介中会有很显著的向前和向后散射，这使得想要创造出能简化这些散射方程的更优算法更加困难。

With the help of these two points of relation, he hoped to project his lines forward and backward indefinitely, subject to correction from any one who should know better.

借助这两个关系点， 他希望无限期地向前和向后投射他的线条， 并接受任何更了解的人的纠正。

There are, as you know, actions within actions, thrusts forward and backward, in and out and in all directions. And so in Ruburt's manuscript there existed a vitality that of itself would bring about other actions, as indeed I foresaw.

如你所知，在行动之内还有行动，向前向后，向内向外，向各个方向推进。因此，在鲁伯的手稿中，存在着一种生命力，这种生命力本身就会带来其他的行动，这的确是我所预见的。

Just as the breezes of speech blow from the breast of the opinionated, so also the soul is tossed this way and that, driven forward and backward, and the light is obscured to it and the truth not seen.

正如言论的微风从固执己见者的胸中吹来一样，灵魂也被抛来抛去，前后颠簸，光明被遮蔽， 真理也看不见。