英语语句纠错Compared tolast decade,today’s population has doubled

英语语句纠错
Compared tolast decade,today’s population has doubled and even trebled,which puts serious pressure on housing supply.As a result,old houses must be substituted for new ones that have more efficient utility,let alonevery traditional ones.
let alonevery traditional ones.的alonevery看来是打错了.那应该是什么?