it's up on the air 尚未断定 ; 悬而未决
But last week, Liu said that it's all still up in the air and depends on his recovery, according to media reports in Chinese.
但据中国媒体报道，刘翔上周称一切都还悬而未决，取决于他的恢复情况。
It's a common complaint: Fly on a crowded plane and come home with a cold. What's in the air up there?
经常有这样的抱怨：搭乘了一班拥挤的飞机，回到家就感冒了。机舱的空气中究竟充满了什么？
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