如题所述
根据上述要求， 例子如下：
1）I find it useful to clean the floor and to protect it at the same time.
意思就是：
我发现它在打扫地板时很有用， 而且同时还能保护地板。
2） I find it helpful to use in my hometown and to make my work conveniently to finish.
1）I find it useful to clean the floor and to protect it at the same time.
意思就是：
我发现它在打扫地板时很有用， 而且同时还能保护地板。
2） I find it helpful to use in my hometown and to make my work conveniently to finish.
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