光，这种毫无疑问沿直线行进的东西也会在经过一个如星系的大质量物体时被弯折而走一条弯曲路线。
Light, which normally and famously travels in straight lines, thus appears to follow a curved path when it passes near a heavy thing such as a galaxy.
尾鳍边缘一定要直或是向外弯曲，不能向内弯折。
Caudal edges have to be straight or curving outwards, and not bending inwards.
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