按照门捷列夫周期表，似乎还有一些元素尚未发现。

According to Mendeleyev's periodic table, there seem to be still some elements undiscovered yet.

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他们支持他们同胞门捷列夫(他创造了元素周期表的第一版)有130年历史的观点。

They support the 130-year-old idea of their countryman Dmitri Mendeleev (who created the first version of the periodic table of elements).

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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.

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So, here we have a picture of Dmitri Mendeleev, who is one of the scientists responsible for first compiling the periodic table.

这是一张德米特里？门捷列夫的画像，他是最早制作,元素周期表的科学家之一。

麻省理工公开课 - 化学原理课程节选