The kind of battle I've been describing to you, a nice flat field, two armies coming at each other, there's not much you can do in the way of trickery, and so you can take a high tone and say, anybody who fights any other way is a no good coward.

我向你们描述的这种战争,土地平坦开阔,两军对垒,没有多大机会使用奸计,所以你能大声地说,谁在战争中使奸就是胆小的懦夫

耶鲁公开课 - 古希腊历史简介课程节选

So if you want to take out any books, you have to do so within the next ten minutes.

要是你要借书的话，你必须在10分钟内办理借书手续。

have to 实战 - SpeakingMax英语口语达人