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。
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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