bird是不是可數(shù)名詞

　　The area has a wealth of bird life.

　　這個(gè)地區(qū)棲息著大量的鳥(niǎo)。

　　The bird had escaped from captivity.

　　那只鳥(niǎo)已經(jīng)逃離樊籠。

　　The bird disappeared into the scrub.

　　鳥(niǎo)消失在矮樹(shù)叢中。