She was flossing her teeth at the time.
当时她正在用牙线剔牙。
Flossing your teeth is one of the best examples of the principles of time management.
用牙线清洁牙齿是时间管理原则的最好佐证之一。
Flossing is the only way to remove the plaque that accumulates between the teeth and below the gum line — areas where a toothbrush can't reach and decay often begins.
牙线洁牙是去除聚集在牙齿之间和牙龈底部牙斑的唯一办法。这些地方因牙刷接触不到会发生腐蚀。
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