They leave a blank space so that they can insert their dialogue while listening to the recording.
他们会留出空白，以便在听录音时插入谈话内容。
2
No country requires proof of cholera vaccination as a condition for entry, and the international certificate of vaccination no longer provides a space for recording cholera vaccination.
没有一个国家要求霍乱疫苗接种证明作为入境条件，并且国际疫苗接种证书不再留出空白记录霍乱疫苗接种。
3
Two of the satellites belong to India. These include a mini satellite, and a remote sensing satellite fitted with a high resolution camera for recording images from space.