听力文本

New York City dentist, Keith Arbeitman states that most people aren't changing their toothbrushes enough.
纽约牙医基思·阿贝特曼说，大多数人更换牙刷的频率都不够+D_2(g*LXMM(KH_^|h。
It is suggested that every three months a toothbrush should be replaced.
建议每三个月更换一次牙刷&z[b.@9cry。

Arbeitman explains, "It really depends how often you use your toothbrush.
阿贝特曼解释说：“这其实取决于你用牙刷的频率|[GhC&vf^-Uy*k-@qN%。
Once the bristles start to bend, you're not really cleaning as effectively."
一旦刷毛开始弯曲，就不能有效地清洁牙齿3C;s01Un&]_#k。”
He says you can check when your brush is ready to exchange by licking your teeth after you brush them.
他说，刷牙后，你可以舔舔牙检查牙刷是不是该换了yu#ku]rK,STwS6d。
If they aren't sleek and smooth than it's time to replace your toothbrush.
如果牙不光滑，那就更换牙刷zMqr!m4i%qyq51~0。

译文属可可英语原创，未经允许，不得转载zVbGEaKNG@wU)e(。

词语解释

1. lick舔
例句：Allan licked the postage stamp and stuck it on the envelope.
阿伦舔了舔邮票，把它贴在信封上8Z3iW;Y0Ih..。

2. sleek光洁的
例句：The end-table one is a small, sleek table made of steel and glass.
这张茶几外观小巧圆滑，由钢铁和玻璃制成6dWd9[_-K5Fz5[。