The advent of something is the time when it first arrives and starts to be widely used. We almost always say the advent of… — the advent of the internet, the advent of cheap air travel.

The advent of something某樣東西的advent(來臨) is the time when it first arrives and starts to be widely used指的是它第一次出現、並開始被廣泛使用的那個時間點。We almost always say the advent of…幾乎都會說the advent of...(...的來臨) the advent of the internet, the advent of cheap air travel像the advent of the internet(網路的來臨)、the advent of cheap air travel(廉價航空的興起)

It is a slightly grand, written word. In speech, people more often say when it arrived or when it became common.

It is a slightly grand, written word這是個帶點氣派、書面的字。In speech, people more often say口語裡人比較常說 when it arrived or when it became common「它是什麼時候出現的」或「它是什麼時候變普遍的」

It is not the same as adventure, even though the two look like cousins: advent is about something arriving, not about a risky trip.

It is not the same as adventure這個字跟adventure(冒險)不一樣 even though the two look like cousins雖然兩個字看起來像親戚 advent is about something arriving, not about a risky tripadvent講的是某樣東西的到來，不是一趟冒險的旅程

With a capital A, Advent is also the Christian season of about four weeks before Christmas, when churches wait for the birth of Jesus. In news and essays, though, the small-a advent is the one you will meet: a big change turning up and spreading.

With a capital A, Advent is also the Christian season大寫的Advent，也指基督教的降臨節 of about four weeks before Christmas是聖誕節前大約四個星期的期間 when churches wait for the birth of Jesus教會在這段期間等待耶穌的誕生。In news and essays, though不過在新聞和文章裡 the small-a advent is the one you will meet你會遇到的是小寫的advent a big change turning up and spreading指的是一個重大改變的出現和擴散

You rarely say an advent on its own; the of-phrase is the natural shape.

You rarely say an advent on its own你很少會單獨說an advent the of-phrase is the natural shapethe advent of...這種of片語才是自然的用法