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The past is always tense, the future perfect.
找到一颗类似地球的行星的可能性,正是推动我们进行系外行星研究的热情所在。
The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.