These synthetic progestins will compete with progesterone receptor binding sites and compete with progesterone rendering progesterone useless.

这些合成的黄体素会与黄体素接竞争，并使黄体素无效。

The multi-beam receiver is also uniquely suited for resolving one of the nagging problems of modern radio-telescopy: screening out radio frequency interference (RFI).

多束接是唯一适合解决现代射电望远镜的一个通病：滤掉电干扰。

Uranium isotope abundance ratio has been measured by total sample evaporation and signal integration,and a thermal surface ionization mass sepctrometry equipped with multicollector has been used.

采用全蒸发技术、离子流强度积分的方式,用多接表面电离质谱计测量铀同位素丰度。