She faces sometimes serious, sometimes moderate, often with a smile.

她的表情时而严肃，时而温和，还常带着微笑。

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Not so in Schwarzenegger's case: he's an example of what is sometimes described as an endangered species, the moderate Republican.

而施瓦辛格的情况就不同了，他是共和党温和派的代表，而这一派有时被形容为濒危物种。

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Photorefractive keratectomy (PRK). PRK is sometimes used if you have a low to moderate degree of nearsightedness or farsightedness, or if you have nearsightedness with astigmatism.

屈光性角膜切除术(PRK)：当你有低于中等度数的近视或者远视，或者近视加散光，有时会选择prk。

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Prescription treatments such as oral or topical tretinoin, topical clindamycin, and sometimes oral antibiotics such as doxycycline or minocycline are needed when acne is moderate.

CNN: How can I get rid of my acne?