I'd prefer to go to Spain. 这里面'd=would 那么句型是 would prefer to do sth么什么意思?还是’d≠would？

I'd prefer to go to Spain. 这里面'd=would 那么句型是 would prefer to do sth么什么意思?
还是’d≠would？

'd = would; would prefer to do sth.我更喜欢做某事.如：
I'd prefer to go to Thailand to spend my holiday.我更喜欢去泰国度假.