the cheapest 表述最便宜的时候和 the least expensive 可以等同。
1. His best selling line is the cheapest lager at £1.99.
2. Old movies were the cheapest broadcast fodder.
3. Britain still boasts the cheapest postal service.
4. He looked through the suits and selected the cheapest one for me.
5. Even the cheapest was priced at 10 pounds.