If the version is lower than the current version, the application must turn on backward compatibility.
如果版本低于当前版本，应用程序必须求助于向后兼容性。
Using buttons, you can move forward or backward in time, to go back to any date and time in the past and return to the current time.
通过按钮能够在时间上前移或后移，能够回到过去的任意时间点，并且能够回到当前的时间点。
The fish had not survived its lengthy time out of the water and was now floating amidst the debris a few feet out from the bank, washed in against the shore by the backward eddy of the current.
那条鱼没有从漫长的脱水时间中幸存下来，现在漂浮在离岸几英尺远的垃圾当中，被反方向的涡流冲刷向河岸。
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