What factors lie behind this trend?
这一趋势背后的因素是什么？
Other motivation may also lie behind Sec.
其他的动机也可能背后秒。
Memories lie behind of all that has happened.
大家都记得以前发生过的事情。
Could political motives lie behind the largesse
慷慨背后，是否暗藏政治玄机？
Some difficulties lie behind us, but greater ones lie ahead.
有些困难已经克服了，但更多困难还在前面。
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