在19世纪向20世纪交替的时候，物理学界尊H．A．洛仑兹为其领袖。那时也正是经典物理向现代物理转变的“世纪之交”。爱因斯坦称洛仑兹为物理学这两个时代之交替时期“最伟大和最崇高的人”。尔今又逢新的世纪之交，今年又是洛仑兹逝世70周年，不禁使我们想起，被认作世纪之交? In the nineteenth century to the 20th century alternating when the physics community respect H. A. Lorentz is its leader. At that time, it was also the “turn of the century” that the transformation from classical physics to modern physics. Einstein called Lorentz “the greatest and the most noble person” in the turn of the two ages of physics. At this juncture of the new century, this year marks the 70th anniversary of the death of Lorentz. We can not but remind us of what is considered the turn of the century.