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“这些元素(稀土)使我们的研究为难,使我们的思索受到挫折;它们时时萦绕在我们的睡梦中,并且在我们面前伸展开像一个不可知的
"These elements (rare earths) perplex our research and frustrate our thinking; they linger in our sleep all the time and stretch in front of us as an unknowable