1.
The Cave of Swallows in Mexico is a 400m vertical shaft, deep enough to engulf the Empire State Building.
原来，墨西哥的燕子洞有四百米深，足以放下整个帝国大厦！
2.
swallow of the northern hemisphere that nests in tunnels dug in clay or sand banks.
北半球燕子，在粘土或沙坝中挖洞筑巢。
3.
bluish-green-and-white North American swallow; nests in tree cavities.
北美洲蓝绿色和白色的燕子；在树洞中筑巢。
4.
Any of various swallows, such as the house martin or the purple martin.
紫崖燕如家燕、紫燕等几种燕子
5.
DENTAL DISEASE OF THE THREE-YAN CULTURES FROM LAMADONG CEMETERY OF BEIPIAO;
北票喇嘛洞三燕文化墓地人骨的牙病
6.
Seven swallows were caught near their nest.
（人们）在燕窝附近捉了七只燕子。
7.
The campus is also known as 'Yan Yuan', the Garden of Yan.
校园又被称作“燕园”，燕子的花园。
8.
The swallow thought about what the prince had said.
燕子想了一想王子的话。
9.
If swallows go away, they will come back again.
燕子去了，有再来的时候；
10.
"dress coat (=tail coat,swallow-tailed coat)"
"燕尾服, (男子)晚礼服"
11.
A swallow cut close to her.
一只燕子从她身旁掠过。
12.
Swallows are nesting in the garage.
燕子正在汽车房做窝.
13.
One swallow does not make a summer.
一只燕子不能造成夏季。
14.
The swallow whirred past.
那只燕子飕地飞掠而过。
15.
A swallow flew past.
一只燕子飞过去了。
16.
Swallows put up very good flight performances.
燕子飞翔婀娜多姿。
17.
Used there to be swallows here?
这里是否一向都有燕子？
18.
A few swallows flashed past.
几只燕子一闪而过。