The prisoner has walked his chalks , and is off to London.
那囚犯逃走了, 逃到倫敦去了.
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A white chalk chalks white on a black blackboard.
一根白色的粉筆在黑色的黑板上寫白字.
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His steed was by chalks the best.
他的馬是最好的.
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Simple teaching tools such as the blackboard, chalks and tape recorders have fallen behind the times.
簡單的教學手段,如黑板 、 粉筆和錄音機已經(jīng)落后于時代.
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Influences of water interaction on the mechanical behaviour of porous chalks have been studied.
我們研究了水對多孔白堊巖的力學性質(zhì)影響.
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