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重点讲解：
1. to date 迄今；到目前为止；
To date there is no evidence to support this theory.
到目前为止，还没有证据支持这种理论。
2. by far (比较时用作强调)显然,…得多，大大地；
By far the most important issue for them is unemployment.
对他们来说最重要的无疑就是失业问题。
3. in service (车辆、设备)在使用中,可以使用；
Cuts in funding have meant that equipment has been kept in service long after it should have been replaced.
资金的削减意味着早该换掉的设备一直在长期运转。
4. be comparable to 与…可比较的，比得上…的；
Yet, on the whole, he is comparable to the best.
但是总体来看他却可以和班上最好的媲美。
