zài / lìshǐ kè shàng / lǎoshī / jiǎngdào / le / yángyè / zhènshǒu / biānjiāng / de / gùshì

在历史课上，老师讲到了杨业镇守边疆的故事。

In history class, the teacher told us about Yang Ye's story of defending the frontier.