例句與造句

1. At 115 and 125 km in diameter, Veritas and 92 Undina are the largest of the 300-strong Veritas Boulder traced the orbits of these bodies back in time, and calculated that they formed in a collision of a body at least 150 km in diameter with a smaller asteroid some 8 million years ago.
2. It's difficult to find boulder tracing in a sentence. 用boulder tracing造句挺難的