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The earliest launch opportunity is now in April - but Nasa said the exact date would depend on how long the technical work would take.，更多细节参见新收录的资料
Why this happens remains a mystery. “We have investigated a lot of hypotheses, and all of them have been wrong,” says Vozenin. Currently, the most plausible theory emerging from her team’s research points to metabolism: Healthy and cancerous cells may process reactive oxygen species—unstable oxygen-containing molecules generated during radiation—in very different ways.，这一点在新收录的资料中也有详细论述
Three properties define a tensor:，更多细节参见新收录的资料