它们的产品包罗万象，从铝到锆石不一而足，故而不易受到某一种金属价格波动的影响。
They produce everything from aluminium to zircon, and so are less susceptible to fluctuations in the price of any particular metal.
一种类型的双胞胎在遗传基因上完全一致, 而另一种类型则在基因上并不一样, 就如同先后出生的兄弟或姐妹.
Twins can begenetically identical or they can be as different as siblings that were born atdifferent times.
大于4亿5千万年前，这种受体出现，它的构象跟现在不一样，这使得它会与另外一种激素紧紧结合，而只是与皮质醇很松散的结合。
Some 450 million years ago, it started out with a different shape that allowed it to grab tightly to other hormones, but only weakly to cortisol.
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