We should learn about first aid,That's necessary for us合并为一句

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Weshouldlearnaboutfirstaid,That''snecessaryforus合并为一句Weshouldlearnaboutfirstaid,That''snecessaryforus合

We should learn about first aid,That's necessary for us合并为一句
We should learn about first aid,That's necessary for us合并为一句

We should learn about first aid,That's necessary for us合并为一句
We should learn about first aid,it is necessary for us.
first aid is necessary for us, so we should learn about it.