1.all sunshine and rainbows无忧无虑
The world isn't all sunshine and rainbows.
We'll get to that shortly.
3.left and right到处都是
We had a picnic on the beach and the seagulls were swarming us left and right.
There is no need to explain. It is pretty self-evident.
5.throw someone under the bus为了一己之利而背叛了别人
Every time the president gets in trouble, he'll throw another cabinet member under the bus.
6.come to the realization意识到
I slowly came to the realization that he had been lying to me.
7.dumb as a brick傻到家了
He is just dumb as a brick.
8.fall prey to被人利用并伤害
It is unfortunately very common for elderly people to fall prey to online scam artists.