VOA慢速英语:Smart Bandages to Heal Wounds More Quickly

短语讲解：

1. They are easy to use, covering up the damaged skin and giving it time to heal.

cover up 掩盖; 掩饰; 盖起来
例句：Sophistry can never cover up the truth.
狡辩无法掩盖事实真相。

2. Hydrogels are similar to human skin.

be similar to 类; 与…相似; 类乎
例句：The scrapie agent in sheep may be similar to viroids.
绵羊的搔痒病因子可能也是类病毒。

3. For example, Zhao said, if there is a sudden increase in temperature, the wound will send out a command.

send out 发出; 发送; 长出
例句：The computer is even able to send out overdue notices.
计算机甚至还能发出图书逾期通知单。