backward and forward chainer 采用前后链规则
backward and forward extrusion 正反挤压
backward and forward bending test 反复弯曲试验
BACKWARD AND FORWARD 回顾过去 ; 来回
Backward and forward buttons 可以向前或者向后按
Backward and Forward Compatibility 向前兼容和向后兼容
backward and forward equations 向前
pace backward and forward 焦急地来回走动
Shall we sway backward and forward, Mary, as if we were dervishes?
玛丽，我们要不要前后晃来晃去，就好像我们是托钵僧似的？
In that sense, Internet use is like a periscope: When users age 50-plus put theirs up, researchers have found, they're looking both backward and forward, toward the past and the future.
在这个意义上，互联网的使用像潜望镜：当使用者年龄50余岁时，研究人员已经发现，他们也在向后和向前的寻找，面向过去和未来。
The backward and forward buttons on your browser's toolbar direct the browser from page to page.
浏览器工具栏中的后退和前进按钮指引着浏览器从一个页面移动到另一个页面。
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