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（38）弗莱明于1885年发现了左手定则和右手定则。同年，英国普利斯表演感应“无线”通信。（39）贝尔的堂兄弟同别人合作，于1886年取得了唱片留声机的专利。翌年，爱弥尔·柏林纳制成唱片留声机。（40）德国青年物理学家赫兹于1888年（时年对岁）发现了电磁波，并证明了电磁?
(38) Fleming discovered the left-hand and right-hand rules in 1885. In the same year, Pulis performed a “wireless” communication. (39) Bell’s cousin, working in partnership with others, acquired the phonograph record gramophone in 1886. The following year, Emile Berliner made a record gramophone. (40) German young physicist Hertz discovered electromagnetic waves in 1888 (years old), and proved electromagnetic?