were to be made是过去将来时的被动语态。be to do可以用作将来时。

例如，要是明天陶瓷烧制完成了，我们就可以提前回家过春节。但一切都不可能，因为我们还没有准备好。

If the ceramic firing was to be made tomorrow, we could go home early for the Spring Festival. But it's impossible, because we're not ready

were to be是系表结构的被动语态

虚拟语气除了表达"不大可能发生的事", 也可以用于"假设"某件事，即假设的事情并没有真正发生。

If we were to add another row to this table, it would have an identifier of 4. 这句是说，假设，我们添加一条新的记录，那这条记录的编号会是4(而不是删掉的那条的编号2)

虚拟语气在这里仅仅表达“假设"，

no one is actually going to add another row to the table, as it is just ahypothesis, or an example.

同样，If you were to improve performance here, you could cache the string instead of re-creating it for every item in the inventory.

假设你想要在这里增加执行效率，那你可以缓存字符串，而不要给每个库存项目重复创建新的字符串。