as compared to的用法, 在此A2用最簡單的方式讓大家理解
A recent review of pay scales indicates that, on average,
CEO’s now earn 419 times the pay of blue-collar workers,
as compared to 42 times their pay, the ratio in 1980.
這裏的as 和關係代名詞which一樣需要指代, 指代對象為the pay of blue-collar workers, 所以the pay和42 times their pay比, 但是差別為關係代名詞接子句
the pay of blue-collar workers, which is compared to 42 times their pay
the pay of blue-collar workers, as compared to 42 times their pay
Among the surest indications on Earth of sunspot cycles is
believed to be the rate at which trees grow, as seen in the rings
visible in the cross sections of their trunks.
以上這句的as指代the rate at which trees grow的the rate, 作後面被動分詞seen的邏輯主語