directional

adj of direction in space 方向的; 定向的: a directional aerial, ie one that transmits or receives radio signals in one direction only 定向天线.

diplomatic immunity, diplomatic service, diplomatically, diplomatist, dipper, dipsomania, dipsomaniac, diptych, dire, direct, direct access, direct action, direct current, direct debit, direct object, direct speech, direct tax, directed, direction, direction-finder, directive, directly, directness, director, director-general, directorate, directorship, directory, dirge, dirigible, dirk, dirndl, dirt, dirt cheap, dirt farmer, dirt road, dirt-track, dirtily, dirty, dis-,