In the mid-1970s, that number was around 30.
20世纪70年代中期，该数字大约为30。
The first computer to use microprocessors became available in the mid-1970s.
使用微处理器的第一部计算机出现于1970年代。
As a young bank executive in the mid-1970s, Charlotte b.
世纪70年代中期还是一位年轻银行高管的拜尔CharlotteB。
As a young bank executive in the mid-1970s, Charlotte b.
世纪70年代中期还是一位年轻银行高管的拜尔CharlotteB。
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