A standard one. Replacement during the first year if all rules for proper use have been followed.
有一个原则,如果在一年内符合各种使用规定,就可更换。
The World Trade Center, an office building for over 1200 firms employing about 50,000 people, is even higher at 411 metres.
世界贸易中心要高得多,有411米。它是一座办公大楼,楼里有1,200多家公司,大约有5万雇员。