The thunder is weak. Thunder and lightning actually happen at the same time, but the speed of light is faster than the speed of sound. Let's see lightning first and then hear thunder. Lightning is a discharge phenomenon between clouds or clouds with different charges and the ground. When the distance between clouds with different charges is reduced to a certain distance due to movement.

The strong potential difference between negative charges will break through the air and cause instantaneous discharge. The discharge spark produced during discharge is the lightning we see, and the sound produced during discharge is thunder.

Brief introduction of couplets:

Couplets are one of the treasures of China traditional culture, also called couplets and couplets, which originated in Fu Tao. The basic knowledge of couplets mainly includes four aspects: basic concepts, development sources, regular characteristics and content classification. Couplets, also known as couplets, couplets, door dangs, etc., are an applied style with a long history and appeal to both refined and popular tastes, and are unique literary treasures of China people.

It requires equal words, conciseness, neatness, uniformity and coordination, and it is a unique form of literary expression. Couplets are composed of three parts: horizontal approval, upper couplet and lower couplet, which are widely used in Chinese New Year, famous mountains and rivers, home, wedding, opening and other occasions. Generally speaking, the knowledge and rules of couplets are mainly aimed at the upper and lower couplets.