他补充道，格林兰冰盖是否会继续加速融化还是一个大问号。
Whether acceleration of melting from the Greenland Ice Sheet will continue, he added, is a big question mark.
由此，你可以猜出关于存在价值的地方大问号标在何处。
One can guess from all this just where the great question mark about the worth of existence was placed.
然而， 这些神奇细胞是否可以修复受损的心脏依旧是一个大问号。
Whether these cells could actually help repair a damaged heart remains an open question, however.
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