ADV
即;那就是;也就是
You use namely to introduce detailed information about the subject you are discussing, or a particular aspect of it.
例句
One group of people seems to be forgotten, namely pensioners...
有一类人似乎被遗忘了，就是那些领养老金的人。
They were hardly aware of the challenge facing them, namely, to re-establish prosperity.
他们几乎没有意识到自己面临的挑战，即再创繁荣。