在15周到18周之间有两个极好的检查可以选择来甄别染色体异常和神经管缺损症状，比如：唐氏综合症和脊柱裂。

There are two test options available between the 15th and 18th weeks to screen for chromosomal abnormalities and neural tube defects such as Down's syndrome and spina bifida.

youdao

然而这条“捷径”和想象中大不相同：它害唐纳组织延误了近三周时间，还让他们多耗费了很多急需物资。

The shortcut was nothing of the sort: It set the Donner Party back nearly three weeks and cost them much-needed supplies.

youdao

仅一周之后，另一研究小组从肌肉萎缩症i型糖尿病糖尿病和唐氏综合征10多种病症的患者那造出更多干细胞。

Only a week later, another team created stem cells from patients with 10 other medical conditions, including muscular dystrophy, type 1 diabetes and Down's syndrome.

youdao