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 we entered the classroom, Angela went to sit at a black-topped lab table exactly like the ones I was used to.
我们走进教室以后，安吉拉坐到一张黑色台面的实验桌后，这种实验桌和我原来用过的一样。
Note: the amplitude measurements shown in Table 3.1 are those values reported in clinical Settings. In a classroom setting, the amplitudes may be much lower.
注意：表3.1中的数据是在临床条件下获得的。在课堂上获得的振幅会更低很多。
In a moment, the classroom is much brighter, and the table is like a bath. We were very glad to see the place we had cleaned.
不一会儿，教室亮多了，桌子像洗过澡一样。看着自己打扫过的干净的地方，我们心里很高兴。
Yes, this would be a tough measure - but we urgently need to restore order and respect in the classroom, and I don't want ideas like this to be off the table.
的确，这对他们非常严格，但是我们急需重建秩序，恢复人们对课堂的尊重。我希望这样的想法得到严肃的对待。
"That takes a lot of options off the table, " says Scott Stewart of Stratfor, an intelligence consultancy. "There's only so much you can do in the classroom instead of out on the streets.
美国私营情报预测机构战略预测公司（Stratfor）的斯科特•斯图尔特说：“那样难以脱离桌面操作，你能做的绝大部分事情都是在教室里，而不是在外面的街道上。”
Now scientists are poised to oblige the producers of that perennial classroom classic, the periodic table, to issue an updated version.
现在科学家们终于可以泰然自若地喊制作人去推出那些一成不变地挂在教室中的元素周期表的升级版本。
Now scientists are poised to oblige the producers of that perennial classroom classic, the periodic table, to issue an updated version.
现在科学家们终于可以泰然自若地喊制作人去推出那些一成不变地挂在教室中的元素周期表的升级版本。
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