Osteoarthritis of the knees presents a particularly serious problem.
膝关节炎似乎带来了很大的问题。
But aching bones still leave researchers perplexed. Osteoarthritis of the knees presents a particularly serious problem.
但骨痛,尤其是膝盖骨关节炎仍然让很多研究者束手无策。
Now many plants have been dispersed to other parts of the States, and unemployment, particularly among blacks, has become a serious problem.
现在,许多工厂已分散到美国其他地方,在底特律,失业,尤其是黑人失业,已经成为一个严重问题。
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