You know, I just recover from a small surgery and I couldn't concentrate myself to reply your letter in English in last two weeks.
你看，我刚刚才做了一个小手术，在过去的两周内我无法让自己集中精力用英文给你回信。
The experimental study on the re-grinding of primary concentrate has been conducted through the investigation and analysis on the process to recover iron concentrate from tailings of ore dressing.
通过对选铁尾矿中回收铁精矿的工艺考查、分析，进行了粗精矿再磨工艺的试验。
They are a compact side and we need to recover our energy for Tuesday and concentrate straight away.
他们是一支打法紧凑的球队，我们需要为周二的比赛恢复精力，并且集中注意力。
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