科学家观察老鼠的行为，来判断特定产品是否对其造成影响。
Scientists observe the behavior of mice to determine how certain products affect them.
孩子的性格也会对其造成影响：有的孩子比其他的孩子更能对抗挫折。
A child's personality can also factor in: Some persist despite frustration better than others.
它们的使用相当广泛，以至于墨西哥和秘鲁白银生产中断，都会对其造成影响。
So widely were these silver coins used that interruptions in the production of silver in Mexico and Peru had a severe knock-on effect.
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