■ altogether 与 all together

两者意义完全不同。

altogether 表示“根本”，用来强调否定、区别的彻底。

• The noise had stopped altogether.杂音全停下来了。
• He abandoned his work altogether.他索性放下了工作。
• That would be another thing altogether.那根本就是另外一回事。
• She became an altogether different person from what she had been.她成了同从前根本不同的一个人。

all together 就是字面上的“全都在一起”的意思。

• The legislators were all together in the hall.议员们全都到大厅来了。

但其实这里的 all 是可有可无的。