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重点讲解：
1. be available to 可被......利用或得到的；可提供给；
The arts should be available to more people at prices they can afford.
他们站在小山之巅，饱览这花园城市的美景。
2. be integral to 对......是不可或缺的；
The command and control must be integral to the architecture and the code developed.
为了把活儿干完，彭妮常常午饭时间也要工作。
3. agree with 适合；赞同；
I don't agree with you at all.
我压根儿就不赞成你的主张。
4. at times 有时；时常；
The match took nearly three hours and was interrupted at times by rain.
比赛进行了将近3个小时，几次因雨而暂停。
