built-up造句
61. NASA gathered the data by radar from orbit, so buildings and trees cause a systematic overestimation of the elevation of built-up and forested areas.
62. A built-up circular piston sound source is established in this paper. The directivity formula of its far field is obtained, and its validity is simulated.
63. Surveys show that remnants of nature in built-up environments can boast impressive populations of some species.
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