1. Red squirrels are now very rare in Britain.
    红色的松鼠在英国已十分罕见了.

2. One apparent exception to the general trends is Japan, where single-parent households and unmarried mothers have remained relatively rare.
    对于这一总体趋势，日本明显是个例外，该国的单亲家庭和未婚妈妈一直相对较少。

3. It is rare to find such genius nowadays.
    这样的天才现在非常罕见.