n. supersonics ; ultrasonics
直到预产期前两周我才最终要求把超音波和遗传学鉴定结果送到我的助产士那里去。
It wasn't until two weeks before my due date that I finally requested the results of a first-trimester sonogram and genetics test be sent to my midwife.
你可以用一些不同的方法，像是X光、测试磁性粒子和超音波，它完全契合我的冶金工程学背景。
You can use different methods, like X-rays, testing magnetic particles, and ultrasonic. It fits in well with my background in metallurgical engineering.
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