When Dmitri Mendeleev devised his periodic table in 1869, it contained 63 elements; a similar chart in a chemistry classroom now has up to 118 entries.
门捷列夫于1869年制定周期表时，表中包含63个元素，而现在化学课堂中一个类似的图表元素已多达118个。
When Dmitri Mendeleev devised his periodic table in 1869, it contained 63 elements; a similar chart in a chemistry classroom now has up to 118 entries.
门捷列夫于1869年制定周期表时，表中包含63个元素，而现在化学课堂中一个类似的图表元素已多达118个。
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