n.

1. 一片浅水；浅水处[C]
2. 浅滩；沙洲[C]
3. 【喻】暗礁，陷阱；潜在危险[P1]

vi.

1. 变浅
   He anchored where the river shoaled.

   他下锚泊在河道的浅水处。

vt.

1. 使变浅
2. 驶入（浅水等）

n.[C]

1. 鱼群[G]
2. 大量，大群[（+of）]
   Emigration had carried to its shores shoals of men and women.

   移民使成群结队的男男女女来到了它的海岸。

vi.

1. （鱼等）成群，群集

n.

1. a large number of fish swimming together.
2. informal, chiefly Brit. a large number of people or things.

v.

n.

1. an area of shallow water.
2. a submerged sandbank visible at low water.

v.

adj.