例如，在亚马逊河流域，能否进入整个地区，将取决于当地船员和其他助手是否愿意进入实力相对强大的美洲印第安人群体居住的地区。
In the Aamazon, for example, access to entire regions would depend on the willingness of local crew members and other assistants to enter areas inhabited by relatively powerful Amerindian groups.
例如，目击者有时会先看几名嫌疑人的照片，然后才尝试去指认他们曾在人群中看到的那个人。
For instance, witnesses sometimes see photographs of several suspects before they try to identify the person they saw in a lineup of people.
西非国家对来自邻国的移民不加限制，这引发了大量人群跨越边界，涌入他国。 例如，从加纳到石油丰富的尼日利亚。
West African countries do not limit immigration from their neighbours, so lots of people cross borders, for example from Ghana to oil-rich Nigeria.
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