The lap strap should go under your belly, across your hips.
安全腰带应该在腹部下，越过臀部
Hence the fad for “teaching aids” such as videos and flashcards for newborns, and “whale sounds” on tape which a pregnant mother can strap to her belly.
因此，许多人都喜欢应用“幼（胎）教工具”，比如为新生儿准备的录像和认字识图卡片，以及孕妇可以绑在肚皮上的“鲸音（whale sounds）”磁带。
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