您要查找的是不是：
- The child was sitting on the bottom stair. 那孩子正坐在楼梯最下面的一级上。
- The office has been humming with activity. 办公室一直忙着搞活动。
- The stair carpet gets a lot of wear and tear and will soon need replacing. 铺在楼梯上的地毯磨损得很厉害，因而很快就要更换。
- The threat of war has depressed business activity. 战争的威胁使经济萧条。
- There has been a lot of activity in the town today. 今天市中心相当热闹。
- The town was humming with activity. 该市镇生气勃勃，呈现一片热闹的景象。
- Stamp collecting is my favorite activity. 集邮是我最喜爱的消遣。
- The store was a scene of great activity. 这家商店顾客盈门。
- He once engaged in anti-government activity. 他一度从事反政府的活动。
- The office is humming with activity. 办公室里一片忙碌。
- Footsteps shuffled on the stair. 楼梯上拖曳着脚步的声响。
- Clutch stair armrest, move carefully step by step. 抓紧楼梯扶手，一步步谨慎地移动。
- He was in agony when he descended a crowded stair. 最使他急得无法可施的是在人丛中走下楼的时候。
- A center of interest or activity. 中心兴趣或活动的中心
- Equipped with stair and doods elerator. 提升机有电动葫芦型和液压升降平台型。
- Showing no optical activity in polarized light. 无旋光的极化光下无光学反应的
- He heard soft footsteps coming up the stair. 他听见有人上楼的轻微脚步声。
- An increase, as in movement or business activity. 进步，改进，改善运动或商业活动的进步或兴隆
- Indulgence in or pursuit of sexual activity. 纵欲; 追求肉欲对性行为的放纵或追求
- The phenomena associated with volcanic activity. 火山现象与火山活动有关的现象
