英文释义:1. not under the control or in the power of somebody else;能够做你想做的或者说你想说的。 not a prisoner or slave。
剑桥英语词典对它的解释是: to be certain to succeed at something because you have done the most difficult part of it 。在棒球比赛中，当击球手击中一个安全的本垒打后，顺利返回本垒，即完成一个得分。
七年级下册英语单词表Unit 1 Can you play the guitarguitar /ɡɪ'tɑ:(r)/ n.吉他sing /sɪŋ/ v.唱;唱歌swim /swɪm/ v.＆n.游泳dance /dɑ:ns/, /dæns/ v.跳舞;n.
Words and Expressions in Each Unit七年级上册英语单词表Starter Unit 1good /gud/ adj. 好的morning /'mɔ:niŋ/ n. 早晨；上午Good morning! 早上好！hi /hai/ interj.
if we take short breaks__.19. Food in small pieces could be eaten easily from the sun twigs which_ turned into chopsticks.20. Walls make of adobe take in the heat from the sun on hot days and give out that heat_ during cool nights， thus warning the house.21. …
