an understanding of or information about a subject after studying and experiencing it
a large mass of ice that forms over long periods of time, especially in polar regions or high mountains
a large piece of floating ice that has broken off from an ice sheet and is floating on the water
a large body of land that is partially surrounded by water but is attached to a larger area of land
an area containing still water that is comparatively smaller than a lake, particularly one that is made artificially
the expansive flat Arctic regions, of North America, Asia, and Europe, in which no trees grow and the soil is always frozen
any of the rocky bodies orbiting the sun, ranging greatly in diameter, also found in large numbers between Jupiter and Mars
小行星
a specific group of stars that form a pattern and have a name related to their shape