[quote="noboru"]In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is lined with lead around the perimeter, thereby improving stability in flight and resulting in longer throws.
A. In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is
B. According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now
...
A. In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is
B. According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now
...
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