Up to now there are no explicit specifications in our country for the design and construction of twin tunnels with small spacing.

在现行的隧道设计施工规范中，还没有明确规定小净距隧道的设计、施工规程。

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In no more than two pages (1.5 spacing, 12pt font), craft a clear, concise, and comprehensive definition.

行距1.5倍、12级字，不超过2页，拟定一清楚、简洁、易解之定义。

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If the cutting ring and eye wear plate is not serious, cutting ring and the eye plate spacing <0.1mm, and no more than 1mm between them in a trench scratches, water law can be used directly.

若切割环和眼睛板磨损不严重，切割环和眼睛板间距＜0.1mm，且它们之间无超过1mm的沟槽划痕，可用直接打水法。

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Though there is no reason to use Dr Knight's invention to replace existing optical fibres, it could, by varying the spacing of the air-filled tubes, make a handy filter allowing selected wavelengths (and the messages they carry) to enter or leave the waveguide while the others are contained.

ECONOMIST: New-age crystals