VOA慢速英语:Scientists Testing Space Propulsion by Light

短语讲解：

1. The answer may come from a small satellite. A Delta V rocket carried the satellite into space earlier this (last) month.

come from 源自; 来自某处; 出生于
例句：Where does it come from?
这究竟从哪里来的？

2. This may seem incredible at first, but it is nevertheless true that sunlight, or light, has momentum even though it has no mass.

even though 哪怕; 即使，纵然
例句：It can do so even though almost all elements operate as intended.
即便几乎所有部件都按预期运转，它也会发生故障。

3. The group says the solar sail can be seen from the earth in the middle of June.

in the middle of 在…的中间;
例句：They put snippets of programming in the middle of ad breaks.
他们在广告时间的中间插播节目制作的片段。