她的头发用发胶打理得非常光滑亮泽。
Her hair looked ___slick and shiny with the styling gel.
他在约会前用发胶把头发往后梳。
He ___slicked his hair back with gel before the date.
赛车手在晴天换上光头胎以获得更好的抓地力。
The driver switched to ___slicks for better grip on sunny days.