我们吃草，但随着天气变暖，森林蔓延，可吃的草越来越少。
We ate grass, but as the weather grew warmer, forests spread and there was less grass to eat.
接触埃博拉患者用过的衣服或床单也可导致感染的蔓延。
Infection may also spread through contact with the soiled clothing or bed linens from a patient with Ebola.
极光是一种辽阔灿烂的环状光带，常常出现在南北两极地区的高空之中，这些光环可蔓延至12，000英里（19，312千米）长。
Vast glowing rings, called auroras, often appear far above the North and South Poles. These rings can be more than 12, 000 miles (19, 312 kilometers) around.
应用推荐