就像一辆车减速一样，在后弯之后前屈之前，脊柱也需要一些时间来恢复到中立状态。
Like a car gearing down, the spine needs some time to return to neutral after back bending before moving into forward bending.
然而，这些类中没有一个是语言中立的，并且将它们的实例序列化到XML中非常困难，有时甚至是不可能的。
None of these, however, are language-neutral, and serializing instances of them into XML is difficult and sometimes impossible.
哥本哈根立志到2025年成为世界第一座碳中立首都城市；马尔默计划到2030年完全依靠可再生能源发电。
Copenhagen aims to be the world's first carbon-neutral capital city by 2025; malmo to be powered entirely by renewable energy by 2030.
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