请问各位:
I heard on the radio that there is evidence that dophins suffer in capitivity
. Dolphins that are free in [X] nature live around 40 years. Captive dophins
live [an] average of 12 years.
第一个[]不能用the是因为nature不能指定,可是我们如果都知道不是要用the吗?
第二个是看作某一个平均的意思吗? 前一句算提到存活寿命吗? 想说可以用the...
刚刚看到另一句:
How many tooth does the average person have?
为什么这边就可以用the呢?