短语讲解：

1. He says the group helps educate more than 2,000 Syrian children.

more than 超过; 不只是; 很; 在…次以上
例句：He supervised and trained more than 400 volunteers.
他指导和培训了400多名志愿者。

2. Experts estimate there are as many as 100,000 children among the 250,000 people trapped in rebel-held areas of Aleppo.

as many as 和…一样多; 不下于
例句：They drew as many as four times that year.
他们那一年四次打成平局。

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