1. Wild cats may feel hungry or thirsty, and your balcony provides them with an opportunity to find food or water.
2. Wild cats may feel scared or scared, such as hearing abnormal sounds or seeing strangers passing by, in which case it will make an aggressive cry.
3. Wild cats may be in estrus, constantly calling to attract their spouses.
4. Wild cats may feel physical pain or discomfort, and cry to relieve pain or attract attention.
Wild cats may think your balcony is their territory and will keep calling for protection of their territory.
On the other hand, some people may think that hearing a cat meow at night is a symbol of bad luck and indicates that something bad will happen. This view may be related to China's traditional ideas, because in China culture, cats are usually regarded as mysterious animals with supernatural powers, and sometimes they are regarded as psychic. But there is no scientific basis, just a manifestation of culture and folk beliefs.
In short, hearing a cat meow at night doesn't necessarily mean that something unfortunate will happen. We should treat this phenomenon rationally and not be too superstitious.