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How does one become the last speaker of a language , as boa sr was before her death in 2010 ?

为何一个人会成为一门语言的最后的使用者，就像boasr在2010年死去之前那样？

After ten years of painstaking crossbreeding , he isolated a gene , sr31 ( sr for stem rust ) that resisted p. graminis .

经过十年痛苦的杂交培育，他分离出了抵抗小麦锈病sr31（sr指茎锈病）基因。

Towards the end of his life obama sr had spent most of his savings .

在走向人生终点的过程中，老obama花掉了他大部分的积蓄。

The test involved a system known as substitutional reality ( sr ) which has been developed at the riken brain science institute 's laboratory for adaptive intelligence in japan .

测试包含了一个叫做现实替代（sr）的系统，该系统是日本riken大脑科学研究所为适应性智能研究所开发的。

The adsorption capacity of sr and cs in several kind of minerals such as att , zeo etc. were studied by static adsorption method .

应用静态吸附法，研究了改性凹凸棒石粘土、沸石等矿物材料吸附sr、cs的性能。