The sample is chosen so that after, say, one hour, there stands a fifty-fifty chance of a decay occurring.
放射性样品选择得很巧妙，假使一个小时之后，衰减的可能性为五十比五十。
According to evolutionary anthropologists, babies of the earliest humans had a fifty-fifty chance of coming out facing backwards.
根据人类进化学家，人类早期时候的婴儿生出来是有二分之一的可能性是倒着的。
Well, Yeal. According to evolutionary anthropologists, babies of the earliest humans had a fifty-fifty chance of coming out facing backwards.
根据人类进化学家，人类早期时候的婴儿生出来是有二分之一的可能性是面向后面的。
Well, Yeal. According to evolutionary anthropologists, babies of the earliest humans had a fifty-fifty chance of coming out facing backwards.
根据人类进化学家，人类早期时候的婴儿生出来是有二分之一的可能性是面向后面的。
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