沟盖

mull over───仔细考虑

mulls over───仔细考虑

pull over───把…开到路边；开到路边；靠边停车；靠岸

pulls over───把…开到路边；开到路边；靠边停车；靠岸

fully cooked───充分煮熟的（cooked是cook的过去分词）

all over───到处，遍及；浑身；全部结束

dust cover───n.[电]防尘罩

If the tunnel in the loess gully towards or parallels to side with the loess Plateau, while cover is thin or bias, it easily occurs collapse or landslides.───假如隧道在较长范围内沿着黄土冲沟走向或者与黄土塬边平行走向，而覆盖层又较薄或偏压很大，就会轻易发生较大的坍塌或滑坡现象。