Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown.
从宇宙射线、辐射到日常饮食，任何东西都可能激活一个处于静止状态下的致癌基因，但如何激活尚不为人知。
How parental age increases autism risks remains unknown, but several hypotheses exist.
父母年龄是如何加大孤独症风险的仍是未知数，但存在一些假设。
Much remains unknown about when and how quickly China is going to start pushing its currency higher. But for once, a rising currency could be good news in Japan.
中国将何时、以何种速度开始升值人民币，目前仍不清楚。不过，至少这次，人民币升值可能对日本来说是好消息。
Much remains unknown about when and how quickly China is going to start pushing its currency higher. But for once, a rising currency could be good news in Japan.
中国将何时、以何种速度开始升值人民币，目前仍不清楚。不过，至少这次，人民币升值可能对日本来说是好消息。
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