She sucked an icecube into her mouth, and crunched it loudly.
她把一冰块儿含在嘴里，并嘎吱嘎吱地大声嚼起来。
《柯林斯英汉双解大词典》
2
A closed system would be, for instance, a glass of ice water with an icecube in it, with the lid on top.
一个封闭系统可以是，比如说，一杯放了一个冰块的冰水，顶上加了盖子。
3
You'll need a plastic mold. You can either use a novelty icecube tray or small ice cream molds, or you can also use used plastic jello or pudding cups.