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一、详细释义：
adj.
训练有素的，优秀的，一流的
例句：
I would form this crack regiment out of officers alone——not a single private.
这个顶呱呱的一团，我要完全用军官来组织――一个兵也不要。
例句：
He is said to be a crack shot, despite weak vision in one eye.
尽管一只眼视力较弱，他仍被称为神枪手。
n.
缝隙，狭缝，窄缝，裂纹
例句：
He climb the steep cliff by get foothold in crack in the rock.
他在岩石缝中找踏脚的地方，慢慢爬上峭壁。
例句：
A little crack detracts from the value of the vase.
小小的裂痕降低了那个花瓶的价值。
爆裂声，噼啪声
例句：
At the very moment, there was a loud crack.
就在那一刹那，突然传来一阵巨大的爆裂声。
例句：
The crack of a rifle is very sharp.
手枪的爆声很尖锐。
重击
例句：
He no sooner recovers his equilibrium than the next porpoise comes along and hits him another crack.
它刚一恢复平衡，第二只海豚接踵而至又给它一击。
尝试，试图
例句：
This is my first crack at cooking.
这是我第一次尝试做饭菜。
例句：
He said he didn't know how to swim but would take a crack at it.
他说他不会游泳，但将尽力尝试。
笑话，俏皮话
例句：
Red always goofs off, or thinks of a smart crack instead of working.
雷德不好好干，总是吊儿郎当，要不就想出些俏皮话来挖苦人。
例句：
When Paul made the crack about the 'famous girl detective', I began to suspect that he had it in for you.
当保罗挖苦你是“著名的女侦探”时，我开始怀疑他是不是故意刁难你。
强效可卡因，强力古柯碱
例句：
Their "lucky bags" contain crack cocaine and cannabis.
他们的”运气袋”里装的是强效的纯可卡因和大麻毒品。
v.
（使）爆裂，破裂 [I,T]
例句：
A gas main had cracked under my neighbor's garage and gas had seeped into our homes.
邻居家车库下的煤气主管道破裂了，煤气渗漏进我们家。
打破，砸开，砸碎 [T]
例句：
You can crack this toughened glass, but you can't break it.
这种韧化玻璃只裂不碎。
例句：
You may crack these nuts with a hammer.
你可以用锤子把这些坚果敲开。
变声 [I,T]
例句：
His voice cracked with emotion.
由于激动，他的声音变得嘶哑。
重击，猛击 [T]
例句：
He wanted to crack the rowdy over the head, but refrained.
他想猛击小流氓的头，可还是忍住了。
例句：
Dad fell and cracked his head against the door.
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