You use although to introduce a subordinate clause which contains a statement that contrasts with the statement in the main clause.
近义词
even though
双语例句
例：
Although he is known to only a few, his reputation among them is very great.
尽管只有少数人知道他，但是他在这些人中的名声却很大。
2.?虽然
You use although to introduce a subordinate clause which contains a statement that makes the main clause of the sentence seem surprising or unexpected.
近义词
though , even though
双语例句
例：
Although I was only six, I can remember seeing it on TV.
虽然当时我只有6岁，我还能记得在电视上看见过它。
3.?虽然
You use although to introduce a subordinate clause which gives some information that is relevant to the main clause but modifies the strength of that statement.
近义词
though , however
双语例句
例：
He was in love with her, although a man seldom puts that name to what he feels.
他爱上了她，虽然一个男人很少用这个词来形容他的感受。
4.?尽管
You use although when admitting a fact about something that you regard as less important than a contrasting fact.
近义词
even though
双语例句
例：
Although they're expensive, they last forever and never go out of style.