centos7查看防火墙状态:Four plus five is nine.

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Four plus five is nine.
四加五等于九。
我把plus换成add行吗？

plus是介词，如果换成add(动词)，句型需要变换：adding up 4 and 5 equals 9. 或者： adding 4 to 5 is 9.

Four added to five is nine.

可以，
add 4 to 5 is equals to 9

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