attach什么意思单词解析at，表示强调，更多例子还有：assist的as, affluent的al, oppression的op.tach，表示接触，我们还背过detach, attachment.
但是当计算完一个loss之后就使用backward方法，发现报错:Pytorch - RuntimeError: Trying to backward through the graph a second time， but the buffers have already been freed. Specify retain_graph=True when calling backward the first time.
No. 2 refrigerating compressor tobe opened， cleaned， inspected and measured. Valve plates to be ground orrenewed， then reassembled.
In February, the world learned a new word, “COVID-19”, which upended our lives. As I write this, half of the world remains confined at home,
环保:environment- friendly，threat of global warming， promote fundamental shifts in the economic system and mode of economic growth，curb environmental pollution/ bring the pollution under control，develop renewable resources ，a low-carbon economy。
考研英语大纲词汇量为5500左右，其中有1500左右的考察频率高的，在理解句子中起主要作用的词汇，叫核心词汇，那么核心词汇就是大家背单词时，优先要记住并理解的单词。JOJO老师已经给大家整理了1517个核心词汇，配备详细的视频讲解。
