1. 血色：sanguineous 含血的 | sanguinity 血色 | sanguinolent 血染的
2. 乐天：sanguinity 血色 | sanguinity 乐天 | sanguinous 多血的
3. 血色/乐天/乐观：sanguinin /血素/ | sanguinity /血色/乐天/乐观/ | sanguinolent /血的/血染的/
1. Esperantists'sanguinity about their future has a lot to do with their history.
noun
1. feeling sanguine
optimistically cheerful and confident
Synonym: sanguineness