He sink down to the bottom, he looked up, he started laughing, he played street hocky, which is get him a stick and push his chair and he holds the stick fine.
他沉到水里，又冒出来抬头看，他开始笑了！他在街上玩曲棍球。
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Schema annotation for bottom-up semantic transparency (developerWorks, May 2005):Push schemata beyond syntax into semantics.
The idea is to be able to sink straight down to the bottom of the pool and stay there exhaling until you are ready to push off the bottom and come back up.