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1·And considering the comet's nearly parabolic orbit, experts said, that first visit may have been its last.

专家们表示，鉴于其近抛物形轨道，鹿林彗星的第一次造访也可能是最后一次。

2·After the first stage burns out it falls back to earth along a parabolic path while the engines of the second stage fire to thrust the rocket into an earth orbit.

当第一级烧毁后，沿抛物线的轨道落到地球，而第二级的发动机点火把火箭发射到地球轨道。

3·The radiant cooler used in the sun synchronous orbit is always designed two stages with a W-shaped parabolic reflector.

在太阳同步轨道卫星上应用的辐射制冷器都采用两级抛物面w型的结构形式。

4·It is shown that if the system possesses the parabolic dispersion relation in the absence of the spin-orbit coupling, the SU (2) spin conductivity still vanishes even without the impurities.

结果表明，当不计入自旋轨道耦合时，如果系统具有平方色散关系，那么即使没有杂质存在，该系统的SU(2)自旋电导率也依然为零。