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。
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；
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。
At twelve weeks, the healing and remodeling of the intra-articular fracture with step-off defect are examined with use of gross, LM and TEM .
目的：研究关节内骨折错位时不同纵向错位程度及运动方式对关节运动功能的恢复及关节软骨损伤修复的影响。
Twelve weeks after surgery, pure screw titanium implants were placed in the proximal metaphyses of the tibiae of rats in both groups. The rats were killed at 4 and 12 weeks after implant surgery.
术后12周于大鼠胫骨处植入纯钛螺纹状种植体，并于种植术后4周及12周分两批处死大鼠；
But surprisingly, programs with a duration of between three and twelve weeks appear to be more effective at reducing anxiety than those lasting more than 12 weeks.
但令人惊讶的是相较于超过12周的运动计划来说，只持续3 -12周的运动似乎较能舒缓焦虑。
But surprisingly, programs with a duration of between three and twelve weeks appear to be more effective at reducing anxiety than those lasting more than 12 weeks.
但令人惊讶的是相较于超过12周的运动计划来说，只持续3 -12周的运动似乎较能舒缓焦虑。
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