palaeoaulacogen古: antiquity; ancientry堑壕构造: aulacogen堑壕: trench; entrenchment; pit 堑壕工事 entrenchment works; 堑壕构造 [地] aulacogen; 堑壕战 trench warfare堑壕底: trench bottom堑壕线: trench line下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:古堑壕构造,即可在微信中查询翻译