15 . 1 canoeist should be able to swim 50m in canoe clothing and must be qualified for 参与活动者必须能在穿著衣服下游泳超过五十米及俱备资格
Observe the canadian horsehoe falls , american falls , goat island and bridal veil falls boat ride 水势一泻五十米直入谷底，汹涌激湍，犹如万马奔腾。
Rennell is mostly covered with dense forest , with a canopy averaging 20 m in height 伦内尔岛大部分被茂密的森林所覆盖，这些森林的平均高度为二十米。
Vehicles exceeding 10 metres in length will be banned to enter cape collison road east of lin shing road 车身长度超过十米的车辆不准进入连城道以东的歌连臣角道。
The obu can compute its own position with accuracy of within up to 10 metres if it has a good visibility of satellites 车上装置可以计算出本身的位置，卫星信号收发良好时误差少于十米。
" it can happen in a short period of time if we look at the historical data , " usery said 但他说，在一万年前，海平面曾在五百年就上升了二十米- -这是一个相对短的时间跨度- -在大陆冰层解体之后。
In february , light rail had already completed the widening works for affluence stop and extended eight platform shelters 元朗丰年路站正进行月台延长工程，月台将延长二十米，方便候车乘客。
