[计] application level gateway

yìng yòng céng wǎng jiān lián jiē chéng xù ㄧㄥˋ ㄩㄥˋ ㄘㄥˊ ㄨㄤˇ ㄐㄧㄢ ㄌㄧㄢˊ ㄐㄧㄝ ㄔㄥˊ ㄒㄩˋ