作为英语学习的过来人，我们能深刻感受到同学们背单词的痛苦，为了帮助千千万万考生摆脱词汇记忆的痛苦，我们精心挑选出来了 570 个高频核心词汇，并且在这 570 个单词的基础之上，通过听、说、读、写四个方面进行扩展，全面掌握核心词汇，轻松搞定托福。
301. illustrate
302. imitate
303. immediately
304. immense
305. immigrate
306. impact
307. impetus
308. implement
309. implicate
310. import
311. impose
312. inadequate
313. incentive
314. income
315. independent
316. indicate
317. indispensable
318. individual
319. induce
320. industrialization
321. inevitable
322. infant
323. influential
324. infrastructure
325. inhabit
326. inherent
327. inhibit
328. initially
329. innovation
330. input
331. inquire
332. insight
333. inspire
334. instruct
335. insufficient
336. integral
337. intelligence
338. intense
339. interact
340. intermediate
341. internal
342. interpret
343. interval
344. intervene
345. intrinsic
346. invasion
347. investigate
348. investment
349. invoke
350. involve
351. irrigation
352. isolate
353. issue
354. justify
355. labor
356. latitude
357. layer
358. legal
359. liberal
360. literature
361. local
362. magnify
363. maintain
364. major
365. majority
366. manufacture
367. manipulate
368. manual
369. marine
370. margin
371. massive
372. maturation
373. maximize
374. meager
375. mechanism
376. media
377. mediate
378. medical
379. mental
380. merchant
381. migrate
382. military
383. minimal
384. minor
385. misleading
386. modify
387. moist
388. monitor
389. moral
390. motive
391. multiple
392. mutual
393. mystery
394. navigate
395. necessitate
396. negative
397. network
398. neutral
399. nevertheless
400. nonetheless
