At twelve weeks a baby smiles and makes vowel-like sounds.

十二周大时，婴儿会微笑，发出类似元音的声音。

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At twelve weeks a baby smiles and makes vowel-like sounds;

十二周的时候，婴儿会笑并且发出类似元音的声音；

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At twelve weeks, the researchers found reduced levels of depression in all three groups.

二星期，研究人员发现三组病人的抑郁程度有所下降。

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Over twelve weeks, researchers at the University of Indiana divided weight loss participants into two groups: a group that went to a traditional fitness center and a group that received their workout training and advice at a virtual gym through Second Life.

FORBES: Can Second Life Help You Lose Weight And Keep It Off?