1. But so far the only evidence for a genetic component has been through statistics, the relationship being inferred mathematically from comparisons of twins and other such studies of close relatives.
    但迄今为止，遗传基因所占比重的仅有的证据只是一些统计数据，即，从对双胞胎的比较，以及对其他血缘接近者的研究中得出的数学统计关系。

2. The component parts of this machine are imported from Japan.
    这台机器的零件是从日本进口的。

3. The apparatus thus described, however, records only the horizontal component of the wave movement, which is, in fact, much more complicated.
    然而，这里所说的仪器记录下来的只是地震波运动中的水平部分，地震波的运动实际比这要复杂得多。

4. Another advance, a computer-controlled brain scanning device, has led to a second discovery by those seeking the biological component of mental abilities.
    另一进展，一台计算机控制的脑部扫描仪，使得寻找思维能力的生理因素的研究人员有了第二个发现。