two level

基本解释

From this we see both two level quoting (>>) and one level quoting (>).
在這個例子中，我們看到了兩層引用（>>）和一層引用（>）。
That is because it does not include two Level 2 process areas, which cover essential best practices for project implementation.
這是由於它沒有包括2級的兩個過程領域，而它們包含了項目實現中基本的最佳實踐。
If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果兩個等高線相切，說明它們的切線相同,也就是說他們的法曏量應該平行,我再在這裡畫個圖。

The city is more than two thousand meters above sea level, near the southern Rocky Mountains in northern New Mexico.
There is no machine yet that can recognize faces or understand sentences at the level of a two-year-old human.
至今還沒有任何機器,能夠做到麪孔識別,或是理解兩嵗兒童能夠輕易理解的句子
耶魯公開課 - 心理學導論課程節選
On one level, there are things like companies that have two . different classes of stock that are economically identical.
一方麪，我們有這樣的例子，有的公司擁有兩種,不同類別的股票，他們在經濟意義上是相同的。
耶魯公開課 - 金融市場課程節選