particular：
值得注意的；特别的；不寻常的
There was nothing in the letter of particular importance.这封信里没什么特别重要的内容.
独特的；单独的；某一种的
"I don't like this particular scarf 我不喜欢的就是这一种围巾
难以取悦的；考究的；挑剔的
He is very particular about his food.
他吃东西很讲究/挑剔.
peculiar：
特有的；独具的
Language is peculiar to mankind.语言是人类特有的.
（常与to连用）特别的；特殊的
a peculiar smell 特殊的气味
奇怪的；不寻常的
This fish has a peculiar taste;这鱼有一种怪味道
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a peculiar person = a very strange person, whereas
a particular person= a fussy person/ someone who likes things a certain (particular)way