Bushfires in Australia are a natural part of the country's ecosystem.

澳大利亚的森林火灾是该国生态系统的天然组成部分。

These record-breaking bushfires in Australia have been kicked off by things like lightning strikes, a few cases of arson and winds.

此次澳大利亚的史上森林大火是由雷击、及其故意纵火和大风等引起的。