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。
Yes, I know, it is still very cold, but soon the weather will turn warm, the birds will begin to sing and it will be time to shed those heavy down jackets.
是的，我知道，现在还很冷，但不久就会转暖的，鸟儿就要开始歌唱，而脱下厚重羽绒服的时刻就要来到了。
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