But previous claims that birds "plan" in this way have been controversial.
但以往关于鸟类以这种方式“未雨绸缪”的诸论断存在争议。
But the same information might have been obtained by less controversial means.
但是这些信息同样可以通过少有争议的手段获得。
In fact, many controversial books in history have now been proven to be completely inaccurate.
事实上，在历史上很多有争议的书现在都被认为是完全正确的。
That would once have been a very controversial assertion.
这一度是一个非常有争议的论断。
China's high-speed rail plans have been highly controversial.
中国高速铁路计划备受争议。
China's high-speed rail plans have been highly controversial.
中国高速铁路计划备受争议。
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