What is useful for us to know according to the passage 翻译

What is useful怎么回答 What is useful for us to know according to the passage 翻译 Climate is useful for guessing what the weather will be like in the future翻译 Knowing what I know is not useful for you.这句话所有成分的分析. they will be more useful than what is common for early prototypes. （what） are they useful （for）? Knowing what I know is not useful for you,这句话konwing是什么词性,what引导的是什么从句? what country is useful at mealtime? what country is useful at meal time? what u live for? The dictionary is e__ useful for beginners. what do you think of the English training center is useful for you?I need some suggestion about it/ We should find out whether it is useful for us to read 中用whether好还是what好 There is ()uand()sin the word useful. so~what i want to say for u is that u are so lovely What is more useful after it is broken? what is more useful after it is broken? What do you think_____ A the most useful invention is B is the most useful invention