What difficulties will be encountered in the internationalization of patent applications?

If there are many countries applying, it is best to take PCT or PPH, so the procedures and expenses can be less. But if you only apply for one country, it is better to follow the normal procedure. To apply for other countries, the agencies in that country need to submit documents upwards, and they need to be entrusted. Moreover, foreign intermediary fees are very high. E-mails are generally in English, so language clearance is required. In addition, if the patent fails at one time and needs to be amended or defended, the cost will be much higher. It should be considered that a country still has about 60 thousand reserve funds left. Moreover, the application is risky and may cost a lot of money. The result is that there is no patent certificate, so the application should be cautious.