题目

In Australia, it’s estimated there are 40,000 daigou, which ____61____ (mean) “on behalf of” in Mandarin. The online shopping agents are almost from mainland China,   ____62____ are young migrants or international students ____63_____ (look) for flexible ways to help cover their rent and university fees. The centre of the trade is in Sydney, a city with a growing Chinese community and frequent flights to China, which makes doing business ____64____ (quick) and smoother. Earlier this year, Beijing ____65____ (tight) regulations on cross- border online shopping, but there is still mo如图所示，在试管内装些水，用软木塞塞住，加热使水沸腾，水蒸气会把软木塞冲出，这个情景中________能转化为________能。在这个实验过程中，还存在的一个能量转化过程是酒精燃烧时________能转化为________能。