Again, the answer lies in backward compatibility.
答案同样是因为向后兼容性。
In case of a backward jump, the navigation continues at the target activity, and, as a result, some activities may be executed again, that is depending on the control flow.
对于向后跳转，导航将在目标活动继续执行，结果可能会再次执行某些活动，这具体取决于控制流。
An owl's head, for example, can twist so far round that it faces backward, but when the bird wants to look forward again, it must turn its head back the way it came.
比如说猫头鹰可以将正脸一直转到后脑勺的位置，但是如果它再想看到正前方的东西，那整个头部只能原路返回了。
The way he was moving was not like a normal person would, it was like a glitching computer; he would "jump" forward, backward or to a side, then back to his normal place again.
他走的样子不像是个正常人，像个短路的电脑似的，他“跳著”向前、退后、或是向侧面走，然后又退回到之前站的位置。
How dreary looked the forest-track that led backward to the settlement, where Hester Prynne must take up again the burden of her ignominy, and the minister the hollow mockery of his good name!
那通往居民区的林中小路看来有多么沉闷，一回到那居民区，海丝特·白兰就得重新负起她那耻辱的重荷，而牧师则要再次戴上他那好名声的空虚的面具！
So again, for this slightly more complicated problem, the ratio of the forward and backward rates are related to the equilibrium constant.
又一次对于这个稍微复杂一点的问题，正向速率和逆向速率的比，和平衡常数相关。
To figure out why they could go forward but not backward, Dr. Thornton and his colleagues looked closely again at the old and new receptors.
为了找出蛋白功能不能逆转的原因，桑顿博士和同事们又仔细的对比了新老两种受体。
These backward priorities will play well on Capitol Hill, where Congress is talking about exchange-rate "adjustments" again and the newest form of protectionism: global warming legislation.
这种逆向优先顺序在国会还是受欢迎的，汇率调节又被重新提了出来，同时在讨论的还有最新形式的保护主义：有关全球变暖的立法。
When this backward branch enters the merge, the merge executes and triggers the fork again, which in turn activates its two outgoing branches.
当此逆向分支进入merge时，将执行merge并再次触发fork，后者又会激活它的两个传出分支。
After looking at the photos, they were asked to count backward from 8, 211 by 7s, then look at another picture of a person they knew but were not in love with, then count backward again.
看完照片之后，他们被要求从8211开始倒数，每隔7个数数一次，数完后再看另一个人的照片，他们与此人相识但不相爱，然后再倒数。
The swoop boomeranged backward, crashed into the tree trunk behind them, then shot forward again, caught in the sticky web.
飞梭摩托向后反弹，撞上他们身后的树干，然后又向前冲去，挂在粘乎乎的蜘蛛网上。
They drove forward and backward, moving 10 feet at a time, again and again.
他们一次又一次前进、后退，而车子每次只移动三公尺。
Once again, keep your arms as straight as possible and feel free to bend your neck backward when moving your arms.
紧接着保持手臂尽可能地伸直并且在移动手臂的同时感觉可以轻松自如地向后屈曲你的颈部。
Once again, keep your arms as straight as possible and feel free to bend your neck backward when moving your arms.
紧接着保持手臂尽可能地伸直并且在移动手臂的同时感觉可以轻松自如地向后屈曲你的颈部。
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