麻烦帮忙分析句子结构、成分.

问题描述:

麻烦帮忙分析句子结构、成分.
In the arena of space research,live animals are still practical alternatives on a flight not considered to be sufficiently safe for human astronauts.

In the arena of space research,(地点状语)live animals (主语)are (谓语)still practical alternatives (表语)on a flight (地点状语)not considered to be sufficiently safe for human astronauts(做flight的定语)