... X-ray shield 释义：X-线屏蔽 light shielding 释义：光屏蔽 screened 释义：部分屏蔽的 ...
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light shielding agents 光屏蔽剂
Double light shielding 双挡光片法
A dial (24) has a light shielding plate (22) on its back.
表盘(24)在其背面具有遮光板(22)。
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The national park applied to the International Dark Sky Association to earn the status, a process that involved having its light pollution levels strictly monitored, and shielding outdoor lighting to make it more dark-sky friendly.
BBC: Five deep dark places for stargazing this summer
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