圖像來源，Getty Images
Comparison of the N-closest and N-convex algorithms using an 8-colour irregular palette with . Left to right: N-closest, N-convex.
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That includes cuts to a significant number of science programmes such as the Mars Sample Return that aims to return samples from the planet's surface to Earth.
A tram derailed and crashed into a building in Milan on Friday, killing two people and injuring 38 others.
骡子还没拉一根麦秆，就失足栽进一个6米深的坑里。五奶奶慌了神，在坑口哭得死去活来。那骡子值几千块钱，要是摔死在坑里，她赔不起。