1. We often speak of seven continents, but you can see that Europe, Asia, and Africa are really one landmass.
    我们经常谈到七大洲, 但你会看到, 欧洲, 亚洲和非洲实际上是一大块陆地.

2. The largest landmass is usually divided into two "continents" along the Ural Mountains.
    习惯上说, 地球上最大的一块陆地是沿着乌拉尔山脉分为两大"洲"的.

3. Oceania is a separate landmass, but it is separated from Asia by very shallow water.
    大洋洲是一块单独的陆地, 但它与亚洲之间只隔着很浅的水域.