At that time, a gallon of gasoline cost 18￠, which today would be close to ＄4——exactly where some experts think we might be headed.请问老师：此处的be headed 是be headed for吗？如果是为什么要省略for？where作什么成分？（等于for which吗？还是作名词？）
Some people obsess over knowing the exact time. They buy clocks and watches that automatically adjust themselves over the Internet or by radio waves. These measurements allow them infinitesimal accuracy in dealing with time.最后一句是什么意思？是说这些方式处理时间非常不精准...
They may get too hot and have to spend more time trying to escape from the sun中 trying to escape from the sun是非谓语动词作状语修饰谓语动词spend吗，所以是方式状语吗。trying to escape from the sun逻辑主语是they对吧。
... * This theory can only be expressed in mathematical language. 这个理论只能用数学语言来表达。这里我有一个问题没看懂：为什么在第4条用法中，将“medical language 医学用语”中的language理解为“术语”，而在第5条用法中，将“mathematical langu...
... separated only by a thin square of glass.第一个句子中的两个宾语从句，不需要用and连接吗？第二个句子中 a reminder, a captured moment, an unspoken
conversation 三个名词短语之间为什么不需要在 an spoken conversation前加and呢？感觉and作为并列连词的...
...ompany. The
chief of every day was spent by him at Lucas Lodge, and he sometimes returned
to Longbourn only in time to make an apology for his absence before the family
went to bed.Mrs.
Bennet was really in a most pitiable state. The very mention of any thing
concerning the match threw her into an a...
...ches of freedom and the security of justice.问题1: upon是介词，demand只能是名词了，那么the riches of freedom and the security of justice可以分析为demand的限制性同位语吗？2.We hold these truths to be self-evident, that all men are created equal.问题2：形容词后的th...
The men who created the U.S. Constitution are often called the country's "founders" or "framers."who created 可以变为 creating, having created, to have created 吗？请老师讲解一下原因，谢谢回答。