中国青年团的夏季活动也是十分受欢迎的。
这个星期7月4日举行的庆祝活动标志美国主题乐园今年夏季活动拉开序幕。
This week's July 4th celebrations marked the beginning of the summer season for America's theme parks.
分布北界的限制因子，在内陆为冬季绝对低温过低，在海滨为夏季活动积温不足。
The limited factors of the north-distribution are colder absolute minumum temperature in winter in inland and not enough active accumulated temperature in seashore.
应用推荐