"the backpacking of oxygen is essential for astronauts"
同义词：packing
backpacking例句
Backpacking experiences Backpacking: diversity and change. Backpacking experiences: A type and form analysis. Energy cost of backpacking in heavy boots Backpacking and hostel‐picking: an analysis from Canada Backpacking Southeast Asia: strategies of "looking local". Backpacking and tourist experience: A type and form analysis A postcolonial analysis of backpacking Lifestyle travellers: backpacking as a way of life. Effects of backpacking holidays in Australia on alcohol, tobacco and drug use of UK residents
