定向: directional; orient; orientation; sense of orientation; predetermined orientation 短语和例子无线电定向 radio range orientation; 给 ... 定向 give an orientation to; 定向爆破 directional [directed] blasting;
呼叫: 1.(呼喊) call out; shout 短语和例子高声呼叫 call out with a loud voice; 他大声呼叫他的妻子。 he called out for his wife.2.[讯] (电台上用呼号叫对方) call; ring; 呼叫表 calling list; 呼叫插塞 calling plug; 呼叫次数 number of calls;
