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Why is that stuff so important? Because without those camps and other stimulating activities, something called summer learning loss occurs. Researchers estimate that low-income students can lose two months of math and reading achievement owing to a lack of reinforcement during the summer break.
Critics of extended school time point to the fact that it's expensive to keep schools open longer. In Massachusetts, for instance, ELT schools receive an additional $1,300 per student, on top of the basic state allotment. And, some ask, if a school is low-performing, if the teachers or curriculums or parental involvement isn't up to snuff, how much good will more class time really do? "You can't just extend time in these schools by 30%," says Elena Silva, an analyst with Education Sector, an independent think tank. "That in and of itself is not going to work as a strategy to turn around schools."
That's why Massachusetts makes schools completely redesign instruction plans before they can receive ELT money. Elsewhere, high-performing charter schools, like those in the Knowledge Is Power Program (KIPP) network, combine more class time with a rigorous curriculum and exceptionally devoted teachers. A typical KIPP school day runs from 7:30 a.m. to 5 p.m., Monday through Friday, with four hours of class every other Saturday and three weeks of mandatory summer school. More hours and days are key, says Steve Mancini, KIPP's public affairs director. But so is everything else. "Time is just a piece of the puzzle," he says. "It's what you do with that time that matters."

A. 어휘
stuff 事案(사안)들, 재료. stimulating activities 동기부여활동. stimulate 자극하다.
learning loss 수업결손, 학습손실. estimate 평가하다. owing to ...때문에.
reinforcement 補强(보강), 강화. summer break 여름방학. critics 비판자들.
extended school time 수업시간 및 수업일수 연장.
additional 증가의, 附加的(부가적)인. allotment 할당.
state allotment 주에서 정한 공납금. involvement 참여.
up to snuff 양호한, 만족할만한. snuff 코로 들이쉬다, 냄새맡다. analyst 분석가.
think tank 연구소. in itself 본질적으로. of itself 저절로. strategy 전략.
turn around 방향을 바꾸다. instruction plan 학습지도 계획.
charter school 정부의 간섭을 받지 않는 독립학교. rigorous 혹독한, 엄한.
curriculum 교육과정. exceptionally 예외적으로. devoted 헌신적인.
every other Saturday 隔週(격주) 토요일. cf. every other day 隔日(격일)로.
mandatory 의무적인, 필수의.

B. 구문
- "It's what you do with that time that matters."
cf. it is A that 강조구문.