| 1 | To cross the intersection, you need to look at the traffic signal lights. | |
| 2 | Drivers should obey traffic signals to ensure traffic flows smoothly. | |
| 3 | After your phone loses signal, you won't receive any incoming calls. | |
| 4 | He sent a signal with gestures to let his teammates attack the enemy. | |
| 5 | We need a computer to send signals controlling the movement of the robot. |
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