1. rose-colored glasses指「對目前的狀況抱持過於樂觀的想法」
Don't put on rose-colored glasses and refuse to look at the bad things in life.
His father, a millionaire businessman, urged him for years to take off the rose-colored glasses and join him in the " real world".
2. barking up the wrong tree指「想尋找某物，但找錯地方或對象」
Frankly speaking, if you're looking for good nutrition in a hot dog, you're barking up the wrong tree.
3. dead tree dead tree version (edition)指「紙張印製出來的檔案或文件，而非存在網路上」
Those articles are only available in dead tree version.
4. grass cutter
I don’t believe that John is the grass cutter behind your back.