小行星对地球的威胁最大，然而，天文学家说，在这一点上很难说木星的作用是好是坏。
Asteroids pose the greatest danger of all to Earth, however, astronomers say, and here Jupiter's influence is hardly assuring.
小行星对地球的威胁最大，然而，天文学家说，在这一点上很难说木星的作用是好是坏。
Asteroids pose the greatest danger of all to Earth, however, astronomers say, and here Jupiter's influence is hardly assuring.
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