慢速英语:Photo Editing App Improves Your Shots

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短语讲解：

1. But when they take a special photo, they might want to make sure that the picture looks its best.

make sure 把事情弄清楚，核实或查明某事物
例句：Make sure the passengers are strapped in(to their seats) before driving off.
开车前请乘客务必系好安全带。

2. This allows users to focus on a part of the image, and blur out the rest.

focus on 致力于; 使聚焦于
例句：As such, focus on getting the orders right for that crucial 20 percent.
所以，必须把重点放在拿到那关键的20%的订单上。

3. The blue filter was added, the app's Focus effect was used to blur the photo, other than a circle around the tree which remains focused.

be used to 习惯于，适用于
例句：A stopwatch is used to obtain the optimum procedure.
秋表用来控制最佳工作进程。