从使用情况来看，闭胸式的使用比较广泛。敞开式盾构之中有挤压式盾构、全部敞开式盾构，但在近些年的城市地下工程施工中已很少使用，在此不再说明。 1 I was playing at my cousin house.Since his family was rich than mine,he had more toys than I did.There was one on particular Id always wanted.I put into my pocket when he wasnt looking.I guessed,even at that age,I would never be able to enjoy to playing with the toy or faced my cousin again;I would always know Id done something wrong.Late on,my aunt drove me home.When she dropped me off,I pulled out the toy slow and gave it
