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Many regions within these clouds can stay like that for ever for millions of years until something happens, a trigger and then a star forms.The trigger for such a monumental event doesn't have to be much, two clouds conbine as they pass, or a distant
探索与发现2015年
信号词 : 时间顺序 Time-Sequence:first, later, next, finally, before, after, now, previously, last, then, when, immediately, formerly, subsequently, presently, initially, ultimately meanwhile 举例 Examplef:or example, such as,for instance, il
托福英语
AA: I'm Avi Arditti, Rosanne Skirble is away. With us this week on Wordmaster: Emily Kissner, a sixth-grade teacher in Pennsylvania and author of a new book called Summarizing, Paraphrasing and Retelling.EMILY KISSNER: When you summarize, you need to
英语单词大师-Word Master
今天我们要学的词组是trigger。 Trigger是扳机，pull the trigger就是扣动扳机。 作为动词，trigger有激发，引起其他事件或是连锁反应的意思。比如布什总统决定向伊拉克增兵，引发了大规模反战抗
英语每日一词
今天我们要学的词组是trigger。 Trigger是扳机，pull the trigger就是扣动扳机。 作为动词，trigger有激发， 引起其他事件或是连锁反应的意思。比如布什总统决定向伊拉克增兵，引发了大规模反战抗
英语单词荟萃
今天我们要学的词是trigger。 Trigger, 是扳机，作为动词，就是引发的意思。当年911恐怖袭击的画面会引起人们痛苦的回忆， Images of 9/11 are likely to trigger bad memories. 印尼外海发生的强烈地震引发
英语每日一词