Abstract: A language learning method is disclosed. The method includes providing a persistent environment such that when a player enters the persistent environment, an interaction between the player and the persistent environment is based on the player's level of a language skill.

Abstract: A method for making foamed products includes the steps of: (a) foaming a foamable blank at an elevated temperature; (b) forming a plurality of blind holes in the blank which has been foamed, by using a mold having a plurality of protrusions, the protrusions pressing the blank to form the blind holes and to create densified depths respectively in the blind holes; (c) cross-cutting the blank along a plane which extends across the blind holes so that the blank is divided into a first foam sheet having a plurality of through holes and a second foam sheet having a plurality of blind bores with the densified depths; and (d) heating the second foam sheet to expand and to form the densified depths into projections protruding from the second foam sheet.

Abstract: A method for making foamed products includes the steps of: (a) foaming a foamable blank at an elevated temperature; (b) forming a plurality of blind holes in the blank which has been foamed, by using a mold having a plurality of protrusions, the protrusions pressing the blank to form the blind holes and to create densified depths respectively in the blind holes; (c) cross-cutting the blank along a plane which extends across the blind holes so that the blank is divided into a first foam sheet having a plurality of through holes and a second foam sheet having a plurality of blind bores with the densified depths; and (d) heating the second foam sheet to expand and to form the densified depths into projections protruding from the second foam sheet.