应该说

• it should be mentioned that ...

例句

1. 这个价钱是每米10英镑，不，应该说是每米12英镑。
   It costs 10 per metre, no, scrub that (ie ignore what I've just said), it costs 12 per metre.
2. 我们不应该说谎。
   We should not tell lies.
3. 你不应该说你朋友的坏话。
   You should not speak ill of your friend.
4. 小孩子不应该说谎。
   Children shouldn't tell tales.