ice over ［up］（不及物）结冰，为冰所封
The pond iced over.池水结了一层冰。
It's very cold today.The windows have iced over.今天很冷，窗户上已结冰。
The plastic sheeting iced over.塑料薄膜上结了冰。
The lake has iced over.You can walk on it.这湖水已冰封，你可以在上面走。
improve on ［upon］（及物，不可分）对…加以改进
The Government tried hard to improve on the people's living conditions.政府努力改善人民生活。
I want to improve on my English.我要提高我的英语水平。
The geneticist has devoted his life to improving on the breed of domestic animals.这位遗传学家一生致力于改良家畜品种。
He improved on his invention.他对自己的发明加以改进。
inch along（不及物）寸步前进
The highway had iced over；the cars were forced to inch along.公路上结冰了，所以汽车只能缓慢移动。
The captive inched along toward the window to get away.俘虏向窗户慢慢挪动脚步想跑掉。
The burglar inched along toward the jewelry counter in the general store so as not to wake the person on duty.夜盗在百货商店里向珠宝柜台慢慢移动，怕惊醒值班人员。
insist on ［upon］（及物，不可分）坚持认为，坚决要求
He insisted on his innocence.他坚持自己无罪。
The judge insisted on the lower court's decision.这位法官维持下级法院的原判。
She insisted on my being disciplined.她坚决要求给我纪律处分。
The workers insisted on higher wages.工人坚决要求提高工资。
itch for（及物，不可分）渴望
She is itching for a sight of her aged mother.她渴望见到她年迈的母亲。
Tom is itching for a Chinese meal.汤姆很想吃一顿中国饭。