读我国土地资源分布示意图，回答以下问题。

歼20是担负我军未来维护领空主权重任的中国第五代隐身重型歼击机。2011年1月11日，歼20在成都实现首飞，这标志着我国隐形战斗机的研制工作掀开了新的一页。材料体现了我国人民军队进行( )

     Two men are walking in the park. One is Mr Brown , a worker, the other is Mr Black. Mr Brown is going to a chair. It is by the road. Mr Black is after him. Mr Brown finds Mr Black. Now Mr Black begins to walk faster(更快). Because he wants to get to the chair before Mr Black. Now Mr Black begins to walk faster because he also wants to get to the chair first. Then they both run .Mr Black runs faster than (比) Mr Brown. So he gets to the chair first and sits down on it. Mr Brown runs after Mr Black. When he gets to the chair. He sees Mr Black sitting on it. He is sorry to show a notice(通知)with the words“Wet Paint(油漆未干)”to Mr Black . Now Mr Black knows why Mr Brown is going to the chair.

“终日乾乾，与时偕行”的观点，与“道之太原出于天，天不变，道亦不变”的观点，反映了（   ）

The Central Park doesn't allow people ____________ in the lake.