1. Indeed, we lack practice and experience nowadays in dealing with primitive conditions.
    确实，我们今天缺乏对付原始环境的实践和经验。

2. It is well known that where the white man has invaded a primitive culture, the most destructive effects have come not from physical weapons but from ideas.
    众所周知，凡是白人侵入原始文化的地方，破坏作用最大的不是杀人的武器，而是思想。

3. It is, in fact, a primitive type of calendar.
    事实上是一种最原始的日历。

4. In 1975, a primitive machine called the Altair, was launched in the USA.
    1975年，美国推出了一台被称为"牛郎星"的原始机型。