I need help with the fourth problem; it perplexes me.

我需要人帮我解第四题；它使我困惑。

youdao

Now, that solves about one-fourth of the problem.

WHITEHOUSE: President Obama��s Town Hall in Cannon Falls, Minnesota

Red Bull did not test the constructors' championship-winning RB6 in the first winter testing session of 2010 and suffered early-season problems when Sebastian Vettel lost the lead at the Bahrain Grand Prix because of a spark plug problem, finishing fourth as a result, before retiring in the following race in Australia with a wheel problem.

BBC: McLaren deny missing winter testing session is risky

Ponting, who averaged 16.14 runs in the series, aggravated the problem during the fourth Test in Melbourne, further displacing the bone fragment.

BBC: Cricket World Cup: Ricky Ponting makes nets return