一些气球飞行家曾提到在舰上使用系留气球的问题.Some balloonists talked of using captive ', ballons from ships.为研究系留气球稳定性,建立了系留气球的三维非线性动力学模型.To stability analysis of tethered balloon, a three dimensional nonlinear mathematical model tethere...
After her mother's death, she became acutely aware of her own mortality.她母亲去世后，她开始强烈意识到自己的生命是有限的。We aren't gods: we must accept our mortality.我们不是神: 要死就得死.Each, in his own way, sits quietly considering mortalit...
noshed on a bagel between classes.课间吃加餐J: Something simple, how about the bagel and cream cheese.弄点简单的吧, 面包圈和乳酪.So you snapped your wire eating a bagel?那么钢丝是在你吃面包圈的时候断的?You can't even get a decent bagel in Washingto...
细胞不断地分裂更新，这是人体发育过程的一部分。Cells divide and renew as part of the human growth process.分裂主义者袭击他们的车辆时，两名警官死里逃生。Two police officers had a narrow escape when separatists attacked their vehicles.优柔寡断与内部分裂深深困扰着该团队。The team has bee...
In 1957, the Soviets launched Sputnik 1 into outer space.1957年，苏联人将“斯普特尼克1号”人造卫星送入了外层空间。A public challenge could provoke the Soviets to dig in.公开挑战会促使苏联人一意孤行.The Soviets would more than recover the ground they had lost.苏...