Young people and HIV: the evidence is clear - act now!
青少年与艾滋病毒：证据确凿，应当即行动！
The police refused to act without more evidence.
因为没有更多的证据，警方拒绝受理。
The evidence is clear and the time we have to act is short.
气候变化的证据是清楚的，而可供我们采取行动的时间很短。
The evidence is clear and the time we have to act is short.
气候变化的证据是清楚的，而可供我们采取行动的时间很短。
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