这种物质是约翰霍普金斯大学医学院的罗杰·克莱姆教授和理查德哈甘耐尔教授在研究训练老鼠把一种特定的声音和电击联系在一起这一课题时发现的。
Roger Clem and Richard Huganir of the Johns Hopkins University School of Medicine made the discovery while studying mice conditioned to associate a particular sound with an electric shock.
约翰那模样好惨，活像一只落水的老鼠。
约翰逊家的猫喜欢追逐老鼠，好象它在跟它们闹着玩似的。
The Johnsons' cat likes to chase the mice as if it were playing with them.
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