adj.持续一周的
The defence must be file and serve in seven day. 答辩必须在7日内呈交和送达。
We get to school at half past seven day. 我们每天七点半到校。
As a rule we deliver the goods within seven day, but in the case of urgent order, we can deliver them within four day. 按照惯例，我们在收到订单后七日内交货，对于急件，可在四日内交货。
Goods purchased in this store is refundable within seven day. 在本店购买的商品七天内可以退换。
You must give seven day's advance notice of withdrawal from the account. 若从帐户中提款，则必须提前七天通知。
You must give seven day 's advance notice of withdrawal from the account . 若从帐户中提款，则必须提前七天通知。
