虽然没有明显的敌意，但黑人学生和白人学生还是交往不多。
Although there is no overt hostility, black and white students do not mix much.
那天至少有400人在这个小岛上，但仅有一半人生还。
About 400 people are believed to have been on the island that day; only about half survived.
头皮屑可以遗传，但什么原因导致了片状东西的产生还是一个谜。
Dandruff can be hereditary, but it's still a mystery what causes the flaky stuff.
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