真空: [物理学] vacuum; empty space; vacuo 短语和例子高真空 fine [high; perfect] vacuum; 极高真空 extreme high vacuum; 未尽真空 partial vacuum; 产生真空 produce a vacuum; 制造一个权力真空状态 create a power vacuum; 真空包装 vacuumiz
距离: 1.(相隔的长度) distance; range; gap; space; spacing; separation 短语和例子保持一定距离 keep a certain distance; 扩大距离 increase the distance; widen the gap; 两座房屋之间的距离 the distance between the two houses; 缩小
