He finished his homework although it is difficult.

虽然作业难做，他还是完成了。

youdao

I would consider myself a mediocre shooter , although it is difficult to measure without other shooters around.

我认为自己是个很普通的射手，虽然和周围的其他爱好者比较高下是困难的。

youdao

Although it is difficult for me to determine what kind of salary level I can meet, I should consider 1000 yuan a month appropriate.

虽然我很难确定我能达到的薪水标准，但是，我还是认为一个月1000元对我来说比较合适。

youdao

Although it is inevitably slower and more difficult than any of us would wish, we are mobilizing all resources as fast as we possibly can."

VOA: special.2010.01.16

The drug certainly seems to work in at least some patients, although it is difficult to predict who will benefit.

FORBES: AstraZeneca's Big Green Light

There are suggestions that unemployment can even lead to cardiovascular disease, although it is difficult to prove that job loss causes heart damage.

CNN: Unemployment takes tough mental toll

Renal cell carcinoma accounts for approximately 2% of all cancers diagnosed in the UK, although it is difficult to treat, with a cure rate of about a third.

BBC: Regular painkiller use linked to cancer