3．Thingamajig是什么意思，好象是个合成词
4．You consult yourself with a certain trepidation and take your answer with a grain of salt .
What does this sentence mean ?paticularly “take your answer with a grain of salt”
5．Of course, once in a while you find the tiny ,pungent details poised on your tongue like cavian.
How to translate this sentence ? What does “pungent” means here? Why would it say”like cavian”? The context is the same as the sentence above.