科研之友
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<正>本有一颗牙齿松动了,姐姐凯特想了好几种方法帮他拔下这颗牙。"I’m always the last," Ben sighed."Last to learn to whistle(吹口哨).Last to lose a tooth.""Jiggle(轻摇)your teeth," said Kate,Ben’s elder sister."Find one that’s loose."Tooth by tooth,Ben jiggled.He jiggled the last tooth."It’s loose.It’s loose!""Tug it,"Kate said."Uh!"Ben mumbled."It’s stuck in my gums(牙龈)."
