铅是早在古代就已知的金属之一。Lead was one of the metals known to the ancient world.水银是一种已知的有毒物质。Mercury is a known poison.人们通常从已知的事实中推断未知的事实.People usually infer an unknown fact from a known fact....
Property of symmetric random variable is discussed by introducing the concept of almost supremum and infimum.讨论了具有倒对称随机变量的若干性质.The transforms of disks and rings and the like will obviously be circularly symmetric.圆盘和圆环等的...
She spread the icing over the cake, dabbing it with a knife.她把糖霜浇在蛋糕上面，并用刀子轻轻涂抹开。She lowered the handkerchief which she had kept dabbing at her eyes.她放下了那块一直用来擦眼睛的手帕。She arrived weeping, dabbing her eyes with a tissue.她来...
Why are these people pulling back refraining from trying new things?为什么这些人宁可往后退也不愿尝试新事物?Refraining from producing speech or vocal sound.缄默的不说话或不发出声音的.It will play a fundamental role in refraining the deterioration of man...
Put a tick next to those activities you like and a cross next to those you dislike.在你喜欢的活动旁打钩，在不喜欢的活动旁画叉。Tick bites can cause Lyme disease.被蜱叮咬会引发莱姆病。Only this last did I tick conviction, thinking we were back on hairdos...
I scored in both games against Barcelona; we drew at home and beat them away.我在两场对阵巴塞罗那队的比赛中都进了球;我们在主场战平，在客场赢了他们。Paris is just a short train journey away, providing the perfect counterpoint to the peace and quiet of Reim...