Involving the most powerful people in a country or an organisation — presidents, ministers, chief executives, generals. You see it constantly in news: top-level talks, a top-level meeting, a top-level official, a top-level decision. It says who is in the room, not how good the thing is; top-level talks can fail badly and still be top-level.

Involving涉及 in a country or an organisation一個國家或組織裡 the most powerful people最有權力的人 — presidents總統、 ministers部長、 chief executives執行長、 generals將軍。 You你 in news在新聞裡 see it constantly會不停看到它： top-level talks高層會談、 a top-level meeting高層會議、 a top-level official高層官員、 a top-level decision高層決定。 It它 says說的是 who is in the room房間裡是誰 not不是 how good the thing is這件事有多好； top-level talks高層會談 can fail badly可以敗得很慘 and still be top-level而仍然是 top-level。

It also has a second, quieter life in computers and business, where it means "at the highest layer, not in the details" — a top-level overview of the plan, or a top-level domain like .com or .tw, which is the last part of a web address.

It它 in computers and business在電腦和商業領域 also has a second, quieter life還有第二個、比較安靜的生命 where it means在那裡它的意思是 "at the highest layer, not in the details"在最上層、不進到細節 — a top-level overview of the plan計畫的最上層概觀 or或 like .com or .tw像 .com 或 .tw 這樣的 a top-level domain top-level domain 頂級域名 which is the last part of a web address也就是網址的最後一段。

As a noun, "at the top level" means among those most senior people. Almost always used before a noun, and it belongs to formal, written English.

As a noun當名詞用時 "at the top level" at the top level means意思是 among those most senior people在那些最資深的人之間。 Almost always幾乎總是 used before a noun用在名詞前面 and it belongs to而且它屬於 formal, written English正式的書面英文。