"with respect to time" and "symmetrical" معنی این دو عبارت در متن زیر چیست؟

Question

Physicists to this day are flummoxed by statistical laws. For one thing, Newton’s laws are symmetrical with respect to time and are therefore reversible. Clearly, in the determined world defined by Newton, what goes forward can also go backward. Obviously not so with statistical laws. How can something that only happens with a probability, not a certainty, be reversible?

Answer 1

یکی از دلایل این است که قوانین نیوتن از لحاظ زمانی متقارن بوده و از اینرو برگشت‌پذیر هستند.