短语讲解：

1. Scientists want to find out about the planet’s beginnings, structure, atmosphere and magnetosphere.

find out 发现; 使发作
例句：You can find out whether they are prepared to share the cost of the flowers with you
你可以弄清楚他们是否愿意和你一起分担买花的费用。

2. The spacecraft was expected to make a total of 37 orbits, or trips, around Jupiter before the mission ends in 2018.

a total of 总数为
例句：Their expenses reached a total of 1, 000 pounds.
他们的花费总计1000英镑。