1. He knits his eyebrows, looking worried.2. When he picked up the phone he began to knit his brows as though something bad just happened.
(verb) knit one's (eye)brows形容你很認真想事情或很緊張或很擔心時皺眉頭的樣子.
1. 他皺起了眉頭, 看起來很擔心的樣子.2. 他皺皺的眉頭令人不敢靠近.
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to rising sa levels.