1. escarpment   noun   

原句: The population went into a dramatic decline and moved to more defensible positions on the escarpment on the sides of the valley.

意思: a steep slope that separates an area of high ground from an area of lower ground

字源: early 19th cent.: from French escarpement, escarpe ‘scarp, a very steep slope’, from Italian scarpa ‘slope’. Compare with scarp. 

例句: The clay lowlands are flanked by steep chalk escarpments.

1. tightly   adverb   

原句: The tomb was so tightly sealed that the team found remains of textiles.

意思: closely and firmly; in a tight manner 

例句: Her eyes were tightly closed.