Thicknesses
n. 层( thickness的复数形式 ); 浓度; 厚（度）; 最厚的部分
🗣️ 情景例句
you need to work at it, Grandpa.
你得常练它， 爷爷。
The Christmas tree is gorgeous.
圣诞树真华美。
'What a day!' I thought.'It's raining again.
“鬼天气！”我想，“又下雨了。