Anticipate where the fireworks are going to explode and consider other aesthetic elements to include in the composition.

要预料烟花将要在哪迸发，并且考虑到其他的审美元素包括构图。

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He said the Federal Bureau of Investigation has asked his firm for the chemical composition of the fireworks it sold to the elder Mr. Tsarnaev, which the company has provided.

WSJ: Latest Boston Charges Point to Fireworks Link