Theoretically, a line can extend into infinity.
上来说直线可以
延伸。
穷大, 
大远的点的，穷的;
,穷;的;;
塘;穷远处Theoretically, a line can extend into infinity.
上来说直线可以延伸。
In this weather the cliff face was a foggy drop into infinity.
在这种天气条件下，雾蒙蒙的悬崖隐入广漠之中。
It is impossible to count up to infinity.
不可能数到穷大。
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