Brian教授在澳大利亚已经五年了，为的是研究澳大利亚土著丰富多样的艺术形式，500多个部落及其复杂的贸易系统。
Professor Brian

has been

has been

already

in

in

Australia

for

for

five years in order to make a research about Aboriginal

rich

rich

of art and 500 different

forms tribes

forms tribes

，with

complex systems

complex systems

of

trade

trade

.