He's the best teacher, even though he has the least experience.
他虽然经验最少，却是最出色的老师。
We made the journey by land, though flying would have been cheaper.
虽然乘飞机会便宜些，我们还是走了陆路。
One major problem did present itself, though.
不过，确实出现了一个重大问题。
We got there early but Mike had already left.
我们及早到了那里，但是迈克已经离开了。
I know you don't like her but try not to make it so obvious.
我明白你不喜欢她，但是尽量别表露得那么明显。
There have been some problems but basically it's a good system.
虽然出现过一些问题，但这基本上仍不失为一个好系统。