The observation of the production of single top quarks (rather than the easier-to-see production of top-antitop quark pairs) has been a goal of the Tevatron experiments for years.

• 然而，使用这种思路来解决现在数码产品的供电问题可能没什么前途，因为人体能够提供的能量并不能算大，而且转换效率也不算高。