622. software n. 软件
623. solar a. 太阳的
624. lunar a. 月的,月球的
625. submerge vi. 潜入水中
626. submit vi. 屈服,听从
627. timber n. 木材,原木
628. tissue n. 组织;薄纱,手巾纸
629. title n. 题目,标题
630. tone n. 语气,音调
631. drift vi. 漂,漂流
632. drip n. 滴
633. durable a. 耐用的,持久的
634. duration n. 持续,持续期间
635. dusk n. 黄昏,薄暮
636. leather n. 皮革
637. legislation n. 法律,法规;立法
638. leisure n. 闲暇;悠闲
639. loose a. 松的,宽松的
640. loosen v. 解开,放松
641. tannest a. 认真的,诚挚的
642. earthquake n. 地震
643. echo n. 回音,回声
644. elaborate a. 精心设计的,复杂的
645. elastic n. 橡皮圈 a. 有弹性的
646. elbow n. 肘
647. electron n. 电子
648. volcano n. 火山
649. volume n. 卷,册;体积,容量
650. fatigue n. 疲劳,劳累
651. faulty a. 有错误的,有缺点的
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