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。
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。
Candidates who are selected for interview will normally receive an invitation (by email or by post) in about eight to twelve weeks from the closing date for application.
申请人如获选参加面试，通常会在截止申请日期后约八至十二个星期内接到通知(以电邮或邮寄方式)。
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；
Lydia Harris: the Burgundy carpet is out of stock; it's going to take twelve weeks. Did you like any of the other colors?
莉蒂亚：酒红色的地毯已经没货了。要调货要十二个礼拜。你还有其他喜欢的花色吗？
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；
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；
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