That helps lower the risk of heavy losses right before the tuition bills roll in, says Morningstar analyst Greg Brown.

晨星分析员格列格.布朗（Greg Brown）说，这样做可以降低学费账单来临前，股市波动导致的资金风险。

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In the technology sector the moats are notably narrower, Morningstar says, noting the risk posed by lax intellectual property protections in China and preference granted to local companies over foreign corporations.

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Though it said the market's enthusiasm for Facebook isn't out of line, Morningstar cited several near-term challenges facing the company, including regulatory risk, privacy concerns and visibility into advertising return on investment.

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Morningstar.com: Free materials on this site include ETF spotlight articles, volatility and risk ratings for various ETFs, total returns for funds going back as far as 15 years and portfolio breakdowns by individual securities, as well as sectors.

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