flat back 底密针 ; 背脊 ; 平底法 ; 收缩防线
flat back method 上向梯段开采法
Flat-back needle 平背针
Flat back face 单向 ; 双向
flat-back stope [矿业] 逆台阶工作面 ; 上向水平分层工作面
flat-back truck 平台型货车
flat back syndrome 平背综合征
flat back turtle 平背海龟
flat-back cut and fill 上向水平分层充填法
The risk of severe back problems and twisted or broken ankles is three times higher for a high heel wearer than for a flat shoe wearer.
穿高跟鞋的人出现严重的背部问题、扭伤或脚踝骨折的风险,比穿平底鞋的人高出三倍。
She injured her spine in a fall and a doctor told her to lie flat on her back for a month so it can mend.
她摔伤了脊椎,医生让她平躺一个月以便恢复。
Then, after I finally got back on the motorway, I developed a flat.
后来,等我终于回到公路上时,我有一个轮胎瘪了。
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