There is a short window of opportunity for a CVS test (usually between 10-12 weeks) and, similar to an amniocentesis, it carries a certain risk of miscarriage.

可以做CVS测试的时间窗非常短（通常10-12周），这个测试类似于羊膜穿刺术，并有一定的流产风险。

youdao

He says he sends off two CVs every day and on average, applies for 12 advertised jobs a week.

BBC: The never-ending search for work