They measure up to 1,200 miles across.
它们处在1200英里高空。
结构分析：They是主语，measure up to是谓语，1,200 miles是宾语，across是状语。
Some of these comets have nuclei measuring up to 100 kilometers.
某些彗星可能有直径超过一百公里的核。
结构分析：Some of these comets是主语，have是谓语，nuclei是宾语，measuring up to 100 kilometers是-ing式词组，作状语。
20210411作业：1. 翻译，并进行句子结构、时态分析。
My uncle Black’s house我叔叔布莱克的家
例句：Then you brought food to My uncle Black’s house.
英语外刊，精读练习：1.句子结构、时态等分析；2.将英文译成中文。Miffed by the worsening insecurity in the country, Nigeria’s former Head of State, Gen. Abdulsalami Abubakar (rtd), yesterday expressed concern over the proliferation of all calibre of weapons in the country, which he estimated at six million.【The Guardian】
