Senecio
n. [植]千里光, 狗舌草
??? 情景例句
He has a large family to feed.
他要養活一個大家庭。
Nothing is difficult to a man who wills.
世上無難事，只怕有心人。
a wave length (the horizontal distance between two wave crests),
波長（兩個浪峰間的水平距離）