One tree swallow was in the nest and the other on guard outside.
一只树燕子在窝里，另一只在外面站岗。
Tree swallow
原声例句
美国小学英语5
美国小学英语6
Get an old, wild-apple tree into the sanctuary for the bluebird, the kingbird, the tree swallow, and the chebec.
为青鸟、王霸鹟、树燕以及北美小霸翁鸟在保护区种植有年头的野苹果树。
美国小学英语5
But on the telephone wire sat a pair of tree swallows, their steel-blue coats and white shirt fronts glistening in the sunlight.
但电话线上坐着一对树燕子，钢蓝色外套和白色衬衫前襟在阳光下闪闪发光。
美国小学英语5
Just as he had hoped, the first bluebirds built in one of the smaller boxes, and a pair of tree swallows in the other.
如他所期，第一只蓝知更鸟的窝建在一个小盒子里，一双树燕住在另一个盒子里。
英语百科
Tree swallow
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The tree swallow (Tachycineta bicolor) is a migratory passerine bird that breeds in North America and winters in Mexico, Central America and the Caribbean. It is a very rare vagrant to western Europe.
This swallow averages 13.5 cm (5.3 in) long and weighs about 20 g (0.71 oz). The bill is tiny. The adult tree swallow has iridescent blue-green upperparts, white underparts, and a very slightly forked tail. The female usually has duller colours than the male, often more greenish than the more bluish male. The juvenile plumage is dull grey-brown above and may have hint of a grey breast band.
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