# Types with variadic arguments can have
合同解除后，保险人应当将自合同解除之日起至保险期间届满之日止的保险费退还被保险人。
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Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.
杜耀豪的母亲与兄弟姊妹的合影，摄于1954年。（受访者供图）