最新研究显示，美国高中学生抽烟的比例降至22年来的最低水平，不过，The study doesn't show whether it's because some high school students have switched to using e-cigarettes. 这项研究并没有说明，高中生抽烟比例下降是否跟某些人转吸电子烟有关。
Two South African women found out recently that their daughters were mistakenly switched at birth four years ago.
