In the doorway of my home, I looked closely at the face of my 23-year-old son, Daniel, his backpack by his side.在家门口，我凝视着23岁的儿子丹尼尔的脸，他的背包就放在身旁。We were saying goodbye.几个小时之后我们即将道别。In a few hours he would be flying to France.他就要飞往法国。He would be staying there for at least a year to learn another langua