At the same time, other students in the same class already have the skill down cold, so further practice for them is a waste of time.
同时，同一个班级的其他学生可能已经熟练掌握了这项技能，所以继续练习对他们来说只是浪费时间。
The Antarctic is comparable to space: It's extremely cold down there and you spend a lot of time indoors.
南极洲和太空有一定的可比性：那里千里冰封、万里雪飘，人们大部时间都躲在室内。
Heat bilges cold everybody understands the reason that shrink, the pore of water Wen Huiling of overheat piece very big, come down for a long time to be able to cause pore instead bulky.
热胀冷缩的道理谁都懂得，过热的水温会令毛孔张得很大，长久下来反而会造成毛孔粗大。
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