求翻译：1948年，美国药理学家Raymond Ahlquist 提出肾上腺素受体可分为α和β两种类型的假设，这个假设在1955年因发现选择性β受体拮抗剂而得到证实是什么意思？

In 1948, U.S. pharmacologist raymond ahlquist proposed adrenergic receptor can be divided into α and β are two types of assumptions, this assumption in the 1955 discovery of the selective beta-receptor antagonist has been confirmed

In 1948, the United States by pharmacologist Raymond Ahlquist epinephrine receptors can be divided into alpha and beta two types of assumptions, this assumption was found in 1955, selective β-antagonist has been confirmed

In 1948, American pharmacologist Raymond Ahlquist proposed the adrenalin acceptor may divide into alpha and beta two kind of type suppositions, this supposition obtained the confirmation in 1955 because of the discovery selectivity beta acceptor antagonist compound

In 1948, the United States pharmacologists Raymond Ahlquist proposed adrenergic receptors can be classified as α and β are two types of assumption, this assumption in 1955 due to discovery of selective beta receptor antagonist which was confirmed

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