诚然，这个任务很困难，但我们还是设法按时完成了。

___Admittedly, the task was difficult, but we managed to complete it on time.

诚然，开车更快，但乘坐火车更环保。

___Admittedly, driving is faster, but taking the train is more environmentally friendly.

诚然，他有一些缺点，但总体上他是个好领导。

___Admittedly, he has some flaws, but overall he is a good leader.