[ti:]

[ar:]

[al:]

[by:听力课堂～www.tingclass.net]

[00:02]assume 假定，假设

[00:14]presume 推测，假定

[00:27]border 边界，边境

[00:38]boundary 分界线，边界

[00:50]frontier 前沿，新领域

[01:03]margin 页边空白;差数

[01:14]