Previous, indirect detections of more than 300 exoplanets had provided breakthroughs of their own.是什么意思？

Previous, indirect detections of more than 300 exoplanets had provided breakthroughs of their own.

此前, 对300多颗系外行星的间接观测都分别取得了突破.

previous

adj. 先前的，以前的，过早的，（时间上）稍前的；adv. 在先，在…以前；

例句
Again the pregnancy was very similar to my previous two...
同样，这次怀孕和我前两次的情形非常相似。

indirect

adj. 间接的，不直截了当的，闪烁其词的，不坦率的；

例句
Businesses are feeling the indirect effects from the recession that's going on elsewhere...
企业感受到了别处经济衰退带来的间接影响。

detections

n. 察觉，发觉，侦查( detection的名词复数 )；

例句
But all exoplanet detections had been of the squiggly variety.
但是此前所有探测到的系外行星都是不起眼波形.

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

more

adv. 更，更多，达到或处于更大的范围或程度，此外，更加；adj. 更多的，（many）的比较级，附加的，额外的；pron. 更多的或附加的人或事物；n. 更多，附加，添加；

例句
It was a Christmas when shoppers passed by expensive silks in favor of more practical gifts.
这是一个购物者不理会昂贵的丝绸衣服而热衷于更实用礼物的圣诞节。

than

conj. 比（用于比较级），宁愿…而不愿，除…以外，一…就；prep. 超过，比；

例句
...more than a thousand acres of land.
1,000多英亩地

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

provided

conj. 如果，假如，在…的条件下；v. 提供，供给( provide的过去式和过去分词)；

例句
She excelled at impersonations, which provided great amusement for him and his friends.
她擅长模仿，给他和他的朋友们带来了很多欢乐。

breakthroughs

n. 突破点，突破性进展，重要的新发现( breakthrough的名词复数 )；

例句
Exciting artistic breakthroughs have recently occurred in the fields of painting, sculpture and architecture...
绘画、雕塑和建筑领域最近出现了激动人心的艺术突破。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

own

n. 自己的事物，自己人；vt. 拥有，承认；vi. 承认；adj. 自己的，特有的；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。