美国科学60秒 SSS 2013-03-05
时间：2019-01-20 作者：英语课 分类：Scientific American(三)月
Women might expect to need new clothes after giving birth. But a bigger pair of shoes? Well, yeah. Because pregnancy 1 can actually lengthen 2 and widen a woman's feet. That’s according to a study in the American Journal of Physical Medicine and Rehabilitation 3 that’s probably not a surprise to a lot of women.
Neil Segal, a rehab doc at the University of Iowa, heard that some local women had to don larger shoes after pregnancy. So he and colleagues measured the feet of 49 women during their first trimester(三个月) and again five months after childbirth. Indeed, nearly half the women went up a shoe size after childbirth, to accommodate their longer, flatter feet. And multiple pregnancies 4 may add to that effect, Segal says.
Pregnant women produce a hormone 5 called "relaxin(松驰肽；耻骨松驰激素)," which makes the pelvis(骨盆) more flexible. That's good for childbirth. But the hormone can affect joints 6 and ligaments(系带；韧带) elsewhere, like in the foot. Adding pregnancy weight to that flexibility 7 can lead to permanent flattening 8 of the foot's arch - associated with knee and hip 9 pain in older women. Segal's now investigating whether custom(定做的) shoe inserts(嵌入物) can protect women against that risk, and help get motherhood off on the right foot.
- Early pregnancy is often accompanied by nausea.怀孕早期常有恶心的现象。
- Smoking during pregnancy increases the risk of miscarriage.怀孕期吸烟会增加流产的危险。
- He asked the tailor to lengthen his coat.他请裁缝把他的外衣放长些。
- The teacher told her to lengthen her paper out.老师让她把论文加长。
- He's booked himself into a rehabilitation clinic.他自己联系了一家康复诊所。
- No one can really make me rehabilitation of injuries.已经没有人可以真正令我的伤康复了。
- Since the wartime population needed replenishment, pregnancies were a good sign. 最后一桩倒不失为好现象，战时人口正该补充。
- She's had three pregnancies in four years. 她在四年中怀孕叁次。
- Hormone implants are used as growth boosters.激素植入物被用作生长辅助剂。
- This hormone interacts closely with other hormones in the body.这种荷尔蒙与体內其他荷尔蒙紧密地相互作用。
- Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
- Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
- Her great strength lies in her flexibility.她的优势在于她灵活变通。
- The flexibility of a man's muscles will lessen as he becomes old.人老了肌肉的柔韧性将降低。
- The thigh bone is connected to the hip bone.股骨连着髋骨。
- The new coats blouse gracefully above the hip line.新外套在臀围线上优美地打着褶皱。