美国的一个物理学家团队通过将一束紫外激光聚焦于一小块氧分子中，发明了一种聚焦于半空中一点的红外激光束。
A team of physicists in the us has created an infrared laser beam at a point in mid air, by focusing a UV laser onto a tiny volume of oxygen molecules.
吃点儿甜食：只是一点点的量，不要吃饭。一小块儿高热量的巧克力就是个不错的选择。
Eat Dessert: a small amount can signal that the meal is over. A piece of high-quality chocolate is a good choice.
只要煮一下豌豆，加上一小块奶油，撒上一点香草，那不就大功告成了。
Just cook the peas, add a pat of butter and sprinkle on some herbs that you already have on hand.
应用推荐