They ____had studied_____ (study) the map of the country before they ___left_____ (leave).

译：他们在离开之前就仔细研究了这个国家的地图。

youdao

A study on the multi-solution of simplifying logic function with Karnaugh map;

线要素化简一直是自动制图综合中的重要研究内容。

youdao

First of all, to study history is to look at a road map of human behavior that has led us to where we are today in the world.

首先，研究历史即是去审视一帧人类行为的“指路图”，让我们明白我们何以会处于目前的状态。

youdao

First of all, to study history is to look at a road map of human behavior that has led us to where we are today in the world.

首先，研究历史即是去审视一帧人类行为的“指路图”，让我们明白我们何以会处于目前的状态。

youdao