After maximum inspiration, client should hold breath for 2 to 3 seconds, then exhale slowly.
After maximum inspiration, client should hold breath for 2 to 3 seconds, then exhale slowly.
至无法吸气时屏气2-3秒钟，然后慢慢呼气。
After maximum inspiration, client should hold breath for 2 to 3 seconds, then exhale slowly.
至无法吸气时屏气2-3秒钟，然后慢慢呼气。