她尝试了多年，但从未成功怀孕。

She had been trying for years, but never managed to ___conceive.

出于某种原因，她两年都未能怀孕。

For some reason, she did not ___conceive for two years.

经过医疗治疗后，她终于怀孕了。

After medical treatment, she finally ___conceived.