重點講解：
1. knock on
敲；擊；
eg. She went directly to Simon's apartment and knocked on the door.
她直奔西蒙的房間，敲了敲門。
eg. Please do not enter before knocking on the door.
進來前請先敲門。
2. on the road
在旅途中；在路上；
eg. He hoped to get a new truck and go back on the road.
他希望能有一輛新的卡車，重新上路。
eg. There are more cars on the road in the summer than in the winter.
夏天路上的車子比冬天多。
3. sleep tight
好好睡；睡得香；
eg. Since that night, all the residents around could not sleep tight.
從那個晚上開始，附近的居民都不得安眠。
eg. I'm not a little tired evening. So sleep tight.
我昨晚很累,因而睡得很香。
eg. Nightie-Night, sleep tight, have a sweet dream.
晚安，睡好了，祝你做個甜蜜的夢。