It is pleasant to see that the whole community has participated in this environmental action

vigor

vigor ['vigə]
n. 活力,精力
例句:
He flung himself into his work with renewed vigor.
他又精神抖擞地投入自己的工作。
Loss of strength or vigor, usually because of disease.
体力衰弱通常由于疾病而导致的力量或精力的丧失
Lacking strength or vigor; weak.
衰弱的缺乏力气或活力的；虚弱的

C精力

C 极大的热情

A
validity
[vəˈliditi]
n.
有效; 效力; 合法性
The tests have been shown to be of dubious validity.
这些试验的有效性已显得令人怀疑。
正当; 正确; 确实
I would question the validity of that assumption.
我会质疑那个假设的正当性。