perimeter

• 指构成封闭几何图形边界的连续线条，或某区域的外缘、周长。也可引申为界限、范围。

A noun referring to the continuous line forming the boundary of a closed geometric figure or the outer edge of an area.

1. Boundary lineB1formal

   The continuous line forming the outer edge of an area or object.

   周长

   • The security guards patrol the perimeter of the building.
   • A fence marks the perimeter of the property.
   • They walked along the perimeter of the park.

   同义词borderboundarycircumferenceedgemarginoutline

2. Enclosing lineB2formal

   A line that encloses a plane area or figure.

   周长

   • The perimeter of a square is four times the length of one side.
   • To calculate the perimeter, add up all the side lengths.
   • The perimeter of the circle is also known as its circumference.

   同义词borderboundarycircumferenceedgelimitoutlineperiphery

3. Total distance aroundB1formal

   The total length of the boundary of a shape or area.

   周长

   • The perimeter of the garden is 50 meters.
   • We measured the perimeter of the field before planting.
   • The perimeter of the lake is about 10 kilometers.

   同义词borderboundarycircumferenceedgegirthoutline

   反义词area