中粘度: 水泵和油泵 、 仪表的检查孔盖、气缸盖 、 油底壳和几乎所有的机加工表面. Medium grade: water and oil pumps, instrument inspection covers , cylinder heads, sumps and most machined surfaces.
他老是记不起把自己阅读时用的放大镜放在什么地方，所以助手们会随身携带备用的。He misplaces his reading glasses with such regularity that aides carry extras.他本该带上一把备用钥匙的。He could have taken a spare key.备用罐上写着“高度易燃”。"Highly inflammable," it says on the spare can...
Most artificial joints are cemented into place.多数人工关节是用骨水泥固定到位的。The knee and ankle joints must be immobilized — this usually means up to six weeks in plaster.膝关节和踝关节必须加以固定——这通常意味着要打上 6 个星期的石膏。The old man's joints we...