boulder tracing漂砾: boulder; erratic block追踪: follow the trail of法: law追踪法: stern chase method; stern-chase method; tracking method化学追踪法: chemical trace method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:漂砾追踪法，即可在微信中查询翻译
