This is necessary because the user may have added items to the Cart and then refreshed the page or navigated away and then back again.
这是必需的，因为用户可能已经向Cart中添加了商品，然后刷新了页面或者导航到其他地方之后又返回来。
Bipolar disorder causes dramatic mood swings from overly "high" and/or irritable to sad and hopeless, and then back again, often with periods of normal mood in between.
双相情感障碍导致激烈地在过分地高亢和/或易怒到悲伤与无望之间反复的情感波动，同时，常常有一个平稳的间歇期在两者之间。
The author thinks that this literature experienced a double negative process:from the mountains and rivers in literature to the Literature of Mountain and River, then back again.
认为中国古代的山水文学经过了由文学中的山水到山水文学，再回归于文学中的山水这一否定之否定的过程；
There is a constant shuffling, as potential energy is transformed into kinetic or elastic energy, and then back again.
能量经常在我们身体里转来换去，从势能转为动能或弹性能，然后再转变回来。
There is a constant shuffling, as potential energy is transformed into kinetic or elastic energy, and then back again.
能量经常在我们身体里转来换去，从势能转为动能或弹性能，然后再转变回来。
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