在你的睡衣后背那缝上一个网球，这样你就不会仰着睡啦。
Try sewing a tennis ball into the back of your pyjama top. This will certainly stop you from sleeping on your back!
斯波克认为让婴儿仰着睡，会因呕吐而窒息，从而导致死亡。
Spock believed that babies on their back can choke on their own vomit - leading to death.
斯波克认为让婴儿仰着睡，会因呕吐而窒息，从而导致死亡。
Spock believed that babies on their back can choke on their own vomit - leading to death.
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