词汇	perennial exhibition
释义	perennial exhibition 常年展览
随便看	how long is that river? how long is the course How long is the course? how long is the flight how long is the flight? How long is the incubation period for SARS How long is the incubation period for SARS? how long is the inseam how long is the inseam? how long is the interval how long is the interval? how long is the journey how long is the journey? how long is the ladder how long is the ladder? how long is the layover how long is the layover? how long is the lease how long is the lease? how long is the lesson how long is the lesson? How long is the life of a man-made satellite How long is the life of a man-made satellite? How long is the post tenable for How long is the post tenable for?