mathematics study efficiency的用法和樣例：
例句
- Study sessions that are too long are generally inefficient and counterproductive.
通常的情況是，一次學(xué)習時(shí)間過(guò)長(cháng)會(huì )使學(xué)習效率降低，并產(chǎn)生反作用。 - The little boy is always absent-minded in class, not to say his study efficiency after class.
這個(gè)小男孩在課上總是心不在焉，更不要說(shuō)他課后的學(xué)習效率了。
