In the recent 50 years since only a few inventions have been made.

而近50年来，只有为数不多的发明。

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Describe the changing trend of water qualities in the river in the recent 50 years using statistics.

用统计分析的方法描绘河水水质近50年的变化趋势。

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The progresses of cotton disease research in the recent 50 years which mainly focused on cotton Fusarium wilt and cotton Verticillium wilt were reviewed.

以棉花枯、黄萎病为主，就我国近50年来，在棉花病害研究方面取得的进展做了较详细的总结。

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In recent years the service has treated about 50, 000 patients annually, prompting the move to larger facilities.

BBC: Royal Eye Infirmary treatment moves to Derriford Hospital

The BBC's Zaffar Abbas in Islamabad says Karachi in particular has a long history of religious and ethnic violence, but the month of May was the worst in recent years - with more than 50 people killed in different incidents of violence.

BBC: NEWS | South Asia | Strike shuts down tense Karachi

In recent years, the final numbers have been 50% higher than the scientists advised.

ECONOMIST: Charlemagne: A fishy tale | The