The act of reaching or stretching out.

伸展。

The state of being lengthened; enlargement.

伸长；扩大。

An addition.

增加；附加。

The property of a body by which it occupies space.

【理】(物体之)广延性。

A mathematical set (as a field or group) that includes a given and similar set as subset.

【数】伸延集(一种数学集，如域或群，包括一已知及相似集作为子集)。

Additional telephone on a line.

(电话的)分机；内线。

An increase in length of time.

延长时间。

A program that geographically extends the educational resources of an institution to persons otherwise unable to take advantage of such resources.

推广教育(如大学附设的补习班、空中大学等)。