最好是这样用英语怎么说

"It's best if it's done this way" 可以用 "It would be preferable to do it this way" 来表达。

"Preferable" 是英语中一个形容词，意思是"更好的，更可取的"。

例句：

It would be preferable to finish the project before the deadline. (在截止日期之前完成项目更好。)
I think it's preferable to take the train rather than drive. (我认为坐火车比开车更好。)
It would be preferable if you could arrive a bit earlier. (如果你能早点到会更好。)