It can be a difficult procedure and it is not always successful.

它可以是一个困难的程序，这是不一定奏效。

youdao

Transplantation is not always successful in the matter of flowers or maidens.

花儿移栽往往并不成功，少女们换了环境也是如此。

youdao

Policy Recommendation 4: Commercialization of research in China is not always successful.

政策建议4：中国研究的商业化并不是都很成功。

youdao

Russia agrees with us on that,". "At the same time that we are very vigorously pursuing this track, we are aware that we might not be as successful as we need to be so we have always looked at the potential of sanctions in the event that we are not successful, that we cannot assure ourselves and others that Iran has decided not to pursue nuclear weapons,"

VOA: standard.2009.10.13

It is not always successful notably in Japan but equally it does not have a downside.

ECONOMIST: Letters

Even highly popular leaders, such as Hugo Chavez, have discovered that such an undertaking is not always successful.

BBC: 'Mistimed coup' in Honduras?

The findings may explain why personalised cancer treatments based on biomarkers from tumour biopsies are not always successful.

BBC: DNA analysis shows huge genetic diversity in tumours