1. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天清晨，她听到头上有飞机飞过，却不知道怎样才能发出信号，

2. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。

3. But we are the ones who signal to businesses that what they are doing is okay — every time we buy their products.
    每当我们购买他们的产品时，我们就在向企业发出信号，告诉他们可以这样做。

4. We´re being deafened by next door´s stereo.
    隔壁的立体声音响要把我们耳朵震聋.

5. Was it the signal?
    这是那信号吗?

6. The soldiers lay in ambush, waiting for the signal to open fire.
    士兵布下伏兵，等待开火的信号。

7. Last night I came home and started playing my stereo. My grandma started yelling,"That´s too loud!
    昨晚我回家，开始放立体音响，我祖母开始大叫，“那太大声了!

8. There is a stereo in the room.
    客厅里有台立体声音响。

9. The stereo is near the door.
    音响靠近门。

10. There are some books on the stereo.
    音响上面有几本书。