在二十世纪上半叶关门倒闭后至今，只有素心一家做出了接近明代丝弦品质的蚕丝冰弦。

From the closure of companies in the first half of the twentieth century until now, only Suxin Silk strings has produced strings of a quality that comes close to Ming dynasty ice strings.

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两位人类学家、语言学家佛朗茨•博厄斯和爱德华•萨皮尔在二十世纪上半叶描述了北美和南美许多土著语言，在这方面他们堪称先驱。

Two anthropologists—linguists, Franz Boas and Edward Sapir, were pioneers in describing many native languages of North and South America during the first half of the twentieth century.

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谷物锈病是二十世纪上半叶最为可怕的小麦疾病，在一次流行当中曾美国损失了其收成的近五分之一。

It was the worst wheat disease of the first half of the 20th century, killing about a fifth of America's harvest in periodic epidemics.

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