到2020年，可再生能源还不能是一个完整的答案。
任务的委派也增加了你根本不能再生还的可能性。
A mission assignment also raises the possibility that you won't come back at all.
截至2020年，公司将不再使用地球上不能快速再生的资源。
By 2020 it would take nothing from the earth that could not be rapidly replenished.
当在我们地方的陆地和海洋变得如此肮脏，我们不能再生活在这里，人类不得不搬迁到别的地方。
When the land or the river was so dirty in our place that we people could not live there, man had to move to another place.
当在我们地方的陆地和海洋变得如此肮脏，我们不能再生活在这里，人类不得不搬迁到别的地方。
When the land or the river was so dirty in our place that we people could not live there, man had to move to another place.
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