如何使用 "key" 造句

1. Housing is the key driver .
住宅才是关键所在。
2. Purpose is key to productivity .
目标是效率的关键。
3. The key issue is price .
问题的关键在于价格。
4. The other key foundation was desperation .
另一个重要论据令人绝望。
5. Giving a key seems to represent death .
给那把钥匙似乎代表着死亡。