Match made in heaven 天生一对；天作之合；天生缘分

【例句】
Unfortunately, Charles and Cristina were not a match made in heaven.
很不幸的是，查尔斯和克里斯缇娜不是天作之合。

It is not a match made in heaven, but we are trying to make it work.
这并不是天造地设的完美婚姻，但我们正在努力做得更好。