当两人初遇之时，他们分别伴在他人身旁，都曾有过海誓山盟，但始终因害怕被束缚而离开恋人。
When they met both were involved with other people whom they swore they loved, but kept leaving out of fear of being confined.
之后，研究人员分别检测两组老鼠的“学习能力”，他们将老鼠放在一个不太舒服的“震动箱”中让它们感到害怕。
They tested learning with an unpleasant "shock chamber" to condition the mice to be afraid.
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