这些树笔直向上生长，只在顶部有分枝。
The trees go straight up; only at the top do they have branches.
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.
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