Sometimes it hails during a summer thunderstorm.

有时,夏天雷雨期间天会下雹.

Flying a silk kite during a summer thunderstorm, Franklin was able to attract an electrical spark to a key tied to the kite string.

在夏季一个风雨交加的日子，富兰克林将一直丝绸风筝放上天空，风筝线上拴着一把钥匙，钥匙吸引了电火花。