美国核能管理委员会和能源部的官员说，他们预计不会有危险剂量的辐射到达美国。
Officials with the U. S. Nuclear Regulatory Commission and the Energy Department say they don't expect harmful radiation levels to reach the U. s.
难道化石燃料里的自由能对于我们的文化进化过程，就相当于危险剂量的类固醇类激素对于人类的生长一样吗？
Could it be that having all this free energy lying around in fossil fuels offered us a dangerous dose of cultural steroids, the evolutionary equivalent of human growth hormone?
超过建议使用的剂量会有危险。
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