miss out 主要是错过的意思；leave out 主要是遗漏，离开的意思；
He misses out on the golden Medal. (他错过了金牌)
She leaves out a decimal point in the data which makes her lose the chance to get the promotion .(她因为遗漏了一个小数点致使她错过了得到晋升的机会)
miss out
英 [mis aut] 美 [mɪs aʊt]
遗漏[忘];（被）略去;错过机会;不理睬（某人）。
1、We're missing out on a tremendous opportunity 。我们在坐失良机。
2、Don't miss out your brother when you send round the invitations. 发送请帖时不要把你兄弟给漏了。
leave out
英 [li:v aut] 美 [liv aʊt]
遗漏; 省略; 未顾及; 忽略
1、Some would question the wisdom of leaving her out of the team
有人会质疑把她排除在队伍之外是否明智。
2、If you prefer mild flavours reduce or leave out the chilli
如果喜欢清淡的口味，可少放或不放辣椒。