let go是放手，顺其自然放开，释放，发射的意思，是个动词词组。let's go是让我们走吧的意思，是一个句子。
She held the photos with the determined grip of a small child and wouldn't let go.
她像小孩一样紧紧攥住那些照片，不肯放手。
When he let go the head lolled sideways
他一放手，脑袋便垂向一侧。
'Let go of me,' she said fiercely.
“放开我。”她极为气愤地说道。
'Let go of me!' he squeaked nervously.
“放开我！”他紧张地尖叫道。
Peterson was let go after less than two years.
不到两年彼得森就被解雇了。
Okay, let's go.
好了，咱们走吧。
Let's go
我们走吧。
Let's go home ─ it's getting late.
咱们回家吧，时间不早了。
Let's go and get some fresh air.
咱们出去呼吸点新鲜空气。
Let's go out for some fresh air.
咱们出去呼吸点新鲜空气。