Reservior sedimentation and its effect on environment are the most serious world-wide problem in water resources developement and utilization today.

水库的修建及伴随而来的泥沙淤积与环境问题是当今世界上水资源开发利用中最关心的问题。

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New research conducted for the U. S. Anti-Doping Agency finds that Americans rank the use of performance-enhancing drugs as the most serious problem facing sports today.

一项由美国反兴奋剂机构发起的调查显示，美国人认为兴奋剂是当今体育圈面临的最大问题。

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As a result, she identified the need for tax reform as the most serious problem facing taxpayers today.

FORBES: Tax Code Hits Nearly 4 Million Words, Taxpayer Advocate Calls It Too Complicated

Olson, in her annual report to Congress, issued today, identified the most serious problem facing taxpayers as Congress' own habit of making frequent, last-minute changes to the tax code.

FORBES: Taxpayers' Biggest Problem? Congress, Says Report