(it's) no wonder (that...); (it's) not surprising (that)
难 · 10 strokes
Simplified from 難. Phonosemantic compound. 隹 represents the meaning and 堇 represents the sound. The character is based on the original meaning "type of bird", which is unrelated to the modern meaning.
怪 · 8 strokes
Phonosemantic compound. 忄 represents the meaning and 圣 represents the sound.