Scientists are still not sure why some rare pandas have brown fur, the report said.
科学家目前还不清楚棕色熊猫产生的原因。
Captain: Why did you not report immediately?
船长：当时为什么不立即报告？
The report did not tell why the average weight of Americans increased.
该报告并未告知美国人的平均体重为什么会增加。
The report did not tell why the average weight of Americans increased.
该报告并未告知美国人的平均体重为什么会增加。
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