1. The classification of the plants on the island took several months.
    用了几个月的时间才把这座岛屿上的植物分类完毕。

2. The trouble is, such an elastic classification ignores the problem of children and the wider problem of caring for others.
    问题是，对家庭的这种灵活的归类忽视了孩子，也忽视了关怀他人这一更广泛的问题。

3. Their language is of unknown origin and cannot be placed within any standard classification.
    他们的语言起源不明，也无法根据任何通常分类来归类。