两侧对称动物在寒武纪繁衍旺盛，因此追踪它们的起源对了解动物是如何进化而来的十分重要。
Bilateral animals flourished in the Cambrian so tracing their origins is crucial to understanding the pace of animal evolution.
接下来，我把每个月的平均成本加起来，计算出每个月的平均值，从而来追踪一段时间内的变化情况。
My next step is to sum up and average the monthly costing figure to track its change over time.
他俩联合的Googleclick公司将在互联网广告业形成一股相当强的力量——Google有99%的利润从广告中而来——并且他有着追踪你的网上行为的可怕能力。
A combined Googleclick would be a force in Internet advertising-google makes 99 percent of its profits from ads-and have an awesome ability to track your online behavior.
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