| 单词 | 难了解 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔keep track〕It's hard to keep track of what's going on.很难了解目前的情况。韦氏高阶〔keep track〕There's so much going on that it's hard to keep track.发生的事情太多了，很难了解情况。韦氏高阶 |
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