We wanted to know if the length of time food is in contact with a contaminated surface affected the rate of transfer of bacteria to the food.
我们想知道食物与被污染的表面接触的时间长短是否会影响细菌转移到食物上的速度。
2
When the whales go to the ocean's surface to breathe, their heart rate is between 25 and 37 bpm.
鲸鱼游到海面上呼吸时，它们的心率达到每分钟25到37次。
3
Rainforests are being cut and burned from Brazil to Indonesia at such a rate that they could well disappear from the earth's surface before the year 2050.