446. elaborate a. 精心的 447. crude a. 未加工的 ~ oil 448. preach v. 说教 449. strive v. 力求 ~ for freedom 450. punctual a. 守时的He is a ~ man. 451. harness v. 治理 ~ a river 452. integrity n. 诚实;完整 453. submit to v. 屈服=yield to 454. launch v. 发起 455. striking a. 显著的 456. instinct n. 本能 457. maintenance n. 保养 458. scrape v. 刮,擦 459. sensible a. 合情理的 460. eliminate v. 去除
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