1. The river is the boundary between the two countries.
    这条河是两国的分界线。

2. With the advance in science, the boundaries of human knowledge are being pushed further out.
    随着科学的发展，人类知识的范围在不断扩大。

1. boundary什么意思

1. 边缘：现在我们来研究T0,T1,T2,T3的边缘(boundary)的性质:T1的边缘是由二端点组成, 的边缘是由三个顶点及三个线段组成, T3是由四个顶点和六个线段及四个三角面组成.

2. 公共查询·英语单词

2. boundary：bdy; 边界

1. （土地的）分界线，边界
    The boundary of an area of land is an imaginary line that separates it from other areas.

    e.g. ...the Bow Brook which forms the western boundary of the wood...
           构成了这片树林西部边界的鲍溪
    e.g. Drug traffickers operate across national boundaries.
           贩毒分子进行跨国贩毒活动。

2. （学科或活动的）界限，边界
    The boundaries of something such as a subject or activity are the limits that people think that it has.

boundary的反义词

    e.g. The boundaries between history and storytelling are always being blurred and muddled.
           历史和轶闻的分界向来是模糊而混乱的。
    e.g. ...extending the boundaries of press freedom.
           扩大新闻自由的界限

1. the greatest possible degree of something

    e.g. what he did was beyond the bounds of acceptable behavior
           to the limit of his ability

    Synonym: limitbound

2. the line or plane indicating the limit or extent of something

    Synonym: boundbounds

3. a line determining the limits of an area

    Synonym: edgebound