You need a mainline for this pattern to work. It doesn't necessarily have to be the trunk though (although the trunk would be a pretty natural choice in most cases).
这个模式需要一条主线才能进行下去，不过不必是主干(虽然在大多数情况下，使用主干是很自然的选择)。
Written English is more or less the same in both Britain and America, though (although) there are some spelling differences.
虽然美国英语和英国英语存在着一些差别，但在笔头上大体是一样的。
He didn't pass the test, even though (or though, although) he studied hard.
虽然他很用功，但他还是没有考及格。
Though/Although my car is very old, it still runs very well.
我的汽车虽然很旧，但仍然运行良好。
Though/Although/Even though it's hard work, I enjoy it.
尽管这项工作艰难，我却喜欢它。
Though [Although] it was raining, we went there.
虽然下着雨，但我们还是去了那儿。
Though (Although) it was expensive, (yet) we decided to buy the computer.
尽管这台电脑很贵，我们还是决定买下来。
Though (Although) it was expensive, (yet) we decided to buy the computer.
尽管这台电脑很贵，我们还是决定买下来。
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