bsl buried service lightguide cableburied optical cable式: type; style光缆: optical cable直埋式光缆: plow in optical cable; plow-in optical cable单模态标准型松包直埋式光缆: fiber optic cable single mode standard loosely buffered direct buried埋式海底光缆: buried submarine cable下载手机词典可随时随地查词查翻译