a bit dense的用法和樣例：
例句
- She is not very clever, but otherwise she's a nice girl.
她並不聰明，但在其他方面，她倒是個好姑娘。 - Diplodocus had a very small brain and was not smart.
梁龍的腦袋非常小,所以它不聰明。 - My head became heavy after a whole day's meeting.
開了一整天會我的頭腦變遲鈍了。 - He's a bit slow but in the end he latches on.
他有點遲鈍，但畢竟還能理解。
