2006年，72岁时他在中国从北部骑到南部，其间只换了三次刹车皮，一根失灵的后刹车线和把手上的皮带。
He crossed China from north to south-in 2006, at 72-with just three brake-block changes, one jammed rear-brake cable and a change of tape on the handlebars.
本文通过几个例子介绍了三次单位根在复数计算、证明与多项式整除中的应用。
This paper, by examples, introduces the application of triple root in the calculation and proof of complex number, and exact division in multinomial.
试验选用三种药剂，三种浓度在生长期间进行三次灌根处理，防治唐菖蒲重茬病害。
The experiment chose 3 medicaments and 3 concentrations by 3 times of irrigating roots to control Gladiolus continuous cropping disease.
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