有一下他差点没抓住一根分枝，他得使劲摆手臂以稳定自己的身体，然后他蹲下来休息。
Once he almost missed a branch and had to swing his arms wildly before he could stabilize his body. Then he squatted down to rest.
问：结核分枝杆菌现在对越来越多的药物产生抗药性，廉价的诊断方法有太多不尽如人意的地方，而卡介苗疫苗的疗效不尽相同，使用至今已有80年之久。
Q: Mycobacterium tuberculosis is becoming resistant to more and more drugs, cheap diagnosis leaves much to be desired, and the BCG vaccine has varying efficacy and is 80 years old.
有一种细菌名叫牝牛分枝杆菌(mycobacterium vaccae)，第110届美国微生物学会大会今天发布的研究结果表明该种细菌也许能够提高我们的学习能力。
It's called mycobacterium vaccae and research presented today at the 110th General Meeting of the American Society for Microbiology found that it might also increase an ability to learn.
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