
他们都未能找到我们地球曾面临过的最严重的问题。
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License: CC BY 2.0 FRLogs
This sentence was initially added as a translation of sentence #727311
added by eastasiastudent, January 25, 2011
linked by eastasiastudent, January 25, 2011
edited by eastasiastudent, January 26, 2011
edited by egg0073, September 10, 2016