营运者有自已的服务对象，消费者又有权找合自已心水价钱的提供者。
The operators have their own service targets. Consumers have the right to look for their favorite price levels and providers.
Arg16等位基因纯合型的孩子同时家中有2个甚至更多的吸烟者的有多5倍的终生喘鸣的风险。
Children who were homozygous for the Arg16 allele and were exposed to two or more smokers had a 5-fold increased risk of lifetime wheeze.
Arg16等位基因纯合型的孩子同时家中有2个甚至更多的吸烟者的有多5倍的终生喘鸣的风险。
Children who were homozygous for the Arg16 allele and were exposed to two or more smokers had a 5-fold increased risk of lifetime wheeze.
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