They're such a strong source of livelihood for very poor people.

它们是收入极低人口的强大生计来源。

Cygnus X-1 is one of the strongest sources of X-rays that is visible from Earth.

天鹅座X-1是地球上可见的最强的x射线源之一。

The sci-fi spectacular is said to have been a strong source of influence for the filmmakers behind modern sci-fi films such as The Matrix, Chronocle, and Looper.

这部科幻大作被认为对现代科幻电影的创作者产生了深远影响，比如《黑客帝国》，《超能失控》和《环形使者》。