pretest underpinning预试: prerun; preliminary examinat ...打: strike; hit; knock支撑: prop up; sustain; support桩: pile; pole; stake支撑桩: column pile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:预试打支撑桩，即可在微信中查询翻译
