Idiom:

No question 毫无疑问

Hit the book:

Episode
Antarctica
Destination
Naval
Expedition
Ecological
Sensitivity
Scenic
Hazard

Antarctica has become one of the world's most popular tourist destinations. Since 1969, the average number of visitors to the continent has increased from several hundred to over 34,000 today. All activities in Antarctica are heavily regulated by the Antarctic Treaty for environmental protection purposes and the industry is largely managed by the International Association of Antarctica Tour Operators (IAATO).