E. and I take part in different kinds of sports, like football, basketball, table tennis, swimming and so on. Sports are popular all over the world.
我参加了各种各样的体育运动，比如踢足球、打篮球、打乒乓球、游泳等等，这些运动都在全世界和盛行。
A celluloid ball(i. e, a table tennis ball) has the permeability for helium and may be used as a soil helium gas collector when burried in the soil.
赛璐珞球（乒乓球）具有渗透氮气的性质，埋于土壤中可作为氦气的收集器。
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