For instance, if a homing pigeon is to navigate with its Sun compass, its clock must be properly set by cues provided by the daylight/darkness cycle.
例如，如果一只信鸽要用它的太阳罗盘进行导航，它必须根据日光/黑暗的循环所提供的线索正确设置时间。
Combination of cultural and natural elements, for instance in biosphere reserves, should be provided to tourists in the form of properly managed "ecotourism".
文化和自然因素的结合，比如在生物圈保存中，应该以生态旅游的方式来向游客们介绍。
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