You might remember the meaning of the character 颤 with this easy mnemonic:
Whenever my dog is trembling in fear, I just put down a lid (亠) over his eyes and some food into his mouth (口). He's scared by everything, from the sun (日) to even just one (一) leaf (頁).
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.