if url in self.seen_urls:
The hoard, which dates to about 50BC and AD50, included five shield bosses and an iron object of unknown origin.
，这一点在旺商聊官方下载中也有详细论述
9. Kafkai — Leading AI Writing Tool for SEOs and Marketers
However, Koch never credited the Hesses for their discovery of bacteriological agar, perhaps because, at the time, he failed to recognize its importance. Even after he received the insight about agar from the Hesses, Koch stuck with gelatine for years. In 1883-84, during his first medical expedition to Egypt and India to investigate cholera, he tried and failed to grow the cholera bacterium on gelatine media in the hot climate of Cairo (despite using a half-open fridge for incubation), only succeeding in the colder winter of Calcutta.
for t := range c {