breastwork造句

1、34a swarthy boy opened a book and propped it nimbly under the breastwork of his satchel.
34一个面色黧黑的少年打开书本，麻利地将它支在书包这座胸墙底下。

2、A breastwork erected during a siege
在围困中建起来的胸墙

3、One of the shells landed on the breastwork of our shelter and did not explode.
其中的一枚落在我们的庇护所的胸墙上。