the climate in taiwan is warmer than （that）of japan,为什么不用one而用that

the climate in taiwan is warmer than （that）of japan,为什么不用one而用that
the climate in taiwan is warmer than （that）of japan,为什么不用one而用that

the climate in taiwan is warmer than （that）of japan,为什么不用one而用that
因为 that 是 the climate的代名词.,one 没法这样使用