1、The megaripples on the desert sand were evidence of the powerful windstorm that had passed through.(在沙漠沙地上出现的巨大涟漪是强风暴过后的证据。)
2、The megaripple carved into the mountain by the ancient glacier was a testament to the immense power of nature.(古代冰川在山上刻下的巨大浪沟证明了大自然的巨大力量。)