It was a difficult birth.

那是一次难产。

《牛津词典》

The CSeries has had a long and difficult birth, but should enter service in 2014.

系列飞机的诞生经历了漫长和艰难的过程，但是，它将在2014年投入使用。

youdao

Chunn that, according to Chinese superstition, AMH was less than an ideal child because of AMH's difficult birth.

贺绍强还告诉春女士：根据中国的迷信，因为难产，小贺梅并非一个理想的小孩。

youdao

Confirming Mister Muse's true age is difficult because birth documents are rare in Somalia.

VOA: special.2009.04.25

Determining Muse's true age is difficult because birth certificates are rare in Somalia,a country which has not had a functioning government for nearly two decades.

VOA: standard.2009.04.22

The CSeries has had a long and difficult birth, but should enter service in 2014.

ECONOMIST: New competition for Airbus and Boeing

"We need to have predictors - when it will be a difficult birth, when a woman might go into early labour, for example, " Prof Wray says.

BBC: Making childbirth safer and easier for women

Male foetuses put much more strain on the mother's body, they are more difficult to give birth to, and they are much more likely to take risks.

BBC: NEWS | Health | Optimists more likely to have boys