Working table fixed, backward moving of double wheel head overall arrangement is used.

采用工作台固定、双砂轮架后移动式布局。

youdao

But moving backward is more complicated, because internally the iterator performs a depth-first, preorder traversal of the Rope, visiting each of its leaf nodes.

但是向后移动要复杂些，因为迭代器内部执行的是深度优先算法，预先排好了Rope遍历的顺序，需要访问每个叶节点。

youdao

And I base it strictly on what I've observed here in Florida, which is that the human race is actually de-evolving, that we are moving backward on the evolutionary scale.

严格意义上，仅限于我在佛罗里达州所观察到的，这里的人种就是这样进化的：我们在进化规模上正在倒退。

youdao

The choice between going backward and moving forward has never been so clear.

WHITEHOUSE: Remarks by the President at a Campaign Event -- Fairfax, VA

The storyline would have to do some major backflips to keep moving forward, and these prequel games show that even moving backward is hard too.

FORBES: God of War: Ascension Review - Teaching an Old Kratos New Tricks

Well the, the, the US Federal Reserve certainly has, is moving aggressively, maybe going for an overkill and the European Central Bank is firmly backward looking and is not moving until inflation has come down so the, there is room to criticise the policy of the European Central Bank.

BBC: News | BREAKFAST WITH FROST | George Soros