If something invariably happens, it always happens — there is no exception, or none the speaker is willing to allow. If a claim is invariably true, it is true every time.

If something invariably happens如果某件事invariably發生 it always happens意思就是它總是會發生 there is no exception沒有例外 or none the speaker is willing to allow或者說話者不願意承認有例外 If a claim is invariably true如果一個說法invariably為真 it is true every time意思是它每次都成立

The word is a bit formal; in chat people usually say always.

The word is a bit formal這個字有點正式 in chat people usually say always平常聊天大家通常會說always

Though actually speakers often use it with a little heat or humour (He is invariably late) rather than as a scientist’s “one hundred percent.” It does not mean “in many different ways” — that would be variously — and it is stronger than often or usually.

Though actually不過其實 speakers often use it with a little heat or humour使用者常常帶點情緒或幽默感在用 (He is invariably late)（像He is invariably late） rather than as a scientist's "one hundred percent"而不是像科學家說的「百分之百」那樣精確 It does not mean "in many different ways"它不是「用很多不同方式」的意思 that would be variously那是variously的意思 and it is stronger than often or usually而且它的語氣比often或usually更強烈

Put it before the verb or adjective it tightens: invariably arrives late, invariably right. If you only need a simple word, always will do; invariably adds a slightly bookish, “you can count on this, for better or worse” feel.

Put it before the verb or adjective it tightens把它放在它修飾的動詞或形容詞前面 invariably arrives late像invariably arrives late invariably rightinvariably right If you only need a simple word如果你只需要一個簡單的字 always will doalways就夠用了 invariably adds a slightly bookish, "you can count on this, for better or worse" feelinvariably則多了一點書面感，帶有「不管好壞，你都可以篤定會這樣」的味道