二十世纪五六十年代

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1.

After the fifties or sixties of the 20th century , environmental protection began to become the prehuman undertaking .

二十世纪五六十年代后，环境保护开始成为全人类的事业。

3.

The first devices , developed in the 1950s and 1960s , were large machines placed on trolleys next to the patient and attached by tubes .

第一个人造心脏装置研发于二十世纪五六十年代，这颗心脏通过一条软管连接到体外的另一部机器上。