Background: Palliation of malignant gastric outlet obstruction remains challenging.

背景：对于恶性胃出口梗阻的缓解尚有困难。

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The outlook for 2003 remains challenging, despite an expected turn-around in the domestic economy.

展望2003年，本地经济可望复苏，但经营环境依然充满挑战。

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Proving metal allergy remains challenging in the absence of definitive clinical or histopathologic diagnostic criteria.

检验金属过敏症仍然缺乏权威的临床或者组织病理学诊断标准。

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"The environment remains challenging, '' he said, "and we are sure to be tested as we go through the year.

BBC: Citigroup profits see strong rise

Deloitte adds that "the overall environment remains challenging" despite some recent big commercial deals by Manchester City and Liverpool.

BBC: Premier League club wages climb to new highs

Despite the rise in overall car sales in August, the SMMT said the outlook for car sales "remains challenging".

BBC: UK car sales in first rise for 14 months, SMMT says