Underwater color photography was born with this shot of a hogfish, photographed off the Florida Keys in the Gulf of Mexico by Dr. William Longley and National Geographic staff photographer Charles Martin in 1926. Equipped with cameras encased in waterproof housing and pounds of highly explosive magnesium flash powder for underwater illumination, the pair pioneered underwater photography.

意譯：海底下的彩色圖片誕生在攝影一種豬形之魚顶级大樵片，照片來自佛羅里達(dá)的墨西哥海灣，由威廉博士長期和國家的路雜志的攝影師查爾斯·馬丁合作于1926年預(yù)備防水設(shè)備的照相機(jī)和高曝光的鎂閃光粉保證能夠在水下照明操逼免费视频网址，他們成為水下攝影的先驅(qū)者亚洲欧洲av官网。

It is active day and night and remains active in winter, when it has been observed tunnelling through the snow and swimming in ice-covered streams.

它不論白天還是晚上都很活躍，甚至在冬天也充滿活力色区综合网，它被發(fā)現(xiàn)通過隧道穿越雪地4444免费，以及在冰面的水下游泳。

The Activated Ploy-oxygen Aerator adopts magnetic engineering technology to send the oxygen of air which is gathered and activated by polyoxier to the mixing chamber of main engine under water, and the process of water and oxygen synthesization is finished rapidly by the use of magnetizer and activated oxygen enriched air under water, which has been cut into tiny air bubbles by the high-speed rotated propeller of the mixing chamber in the process of water and oxygen synthesization, which can increase the affinity of water and oxygen. When flow rate of water is more than the buoyancy force of the tiny air bubbles, it is difficult for the tiny air bubbles to float on water in short time and the tiny air bubbles can stay in water for longer time, which can increase the efficiency of water dissolving oxygen and make the power efficiency of the machine is greater than traditional aerator obviously.

聚氧活化曝氣增氧機(jī)采用磁性工程技術(shù)亚洲大尺度视频无码专区，將空氣中的氧經(jīng)聚氧器聚集活化后送到水下主機(jī)的混合室A级毛片无码免费真人久久久，由水下的磁化器和活化富氧空氣快捷完成水氣合成程序，在水氣合成過程中已被混合室內(nèi)高速旋轉(zhuǎn)的離心葉輪切割成微小氣泡超频碰97观看公开视频，這些隨射流亚洲日韩另类一区欧美、射向水下方的小氣泡，其動(dòng)能消耗至零后人人操人人莫人人vA，在水中的浮力作用下91黄在线、開始緩慢上升，由于提高了水與氧親合力的小氣泡只靠浮力沿著螺旋型的曲線緩慢浮升，這些小氣泡在短時(shí)間很難浮上水面九操在线亚洲，因此延長了小氣泡在水中的停留時(shí)間和行走路程中文字幕黄色福利视频，大大提高水中溶解氧的效率，使該機(jī)的動(dòng)力效率明顯高于傳統(tǒng)曝氣裝置自慰一区二区。

Nanjing Xuanwu Tunnel,a subaqueous highway tunnel in the centre of the city is a typical geoengineering project in vulnerable environment .

南京玄武湖隧道欧美色污在线视频，既在城市中心，又在水下亚洲国产精品激情一区二区，是脆弱環(huán)境下典型的地質(zhì)工程人人操人人爱97。

Aimed at the complex work state, we considered the metacentric stability and the dynamical stability in the situation of above and below the sea lever, studied the movement from the underwater to the surface, so as to prove that the collectivity escaping chamber will not jump out of the water.

針對集體逃生艙工作狀態(tài)復(fù)雜的特點(diǎn)，考慮了在水下和水上兩種情況下的靜穩(wěn)性以及水上情況下的動(dòng)穩(wěn)性日韩欧美视频，同時(shí)研究它從水下到水面的運(yùn)動(dòng)情況黄网站在线观看免费_，以證明集體逃生艙不會(huì)從水面跳出和發(fā)生傾覆。

Nymphoides on the green ooze, oily in the underwater swagger; In the Kang River Roubo years, I will be glad to do a water plant!

在果嶺上滲荇无码A级毛片免费视频，含油在水下昂首闊步久久精品久久；在康河的肉搏年，我會(huì)很樂意做一個(gè)自來水廠国产91精选在线看！

I stayed very deep in the water because I knew that I could be killed by the huge water wheel that powered the boat.

我呆在水下很深的地方激情乱小说欧美视频，因?yàn)槲抑莉?qū)動(dòng)大船的巨型水下渦輪會(huì)要了我的命。

"For three decades I have tried to imagine how it might be possible to build a car that can fly under water," said Rinderknecht in a statement.

在一次陳述中他表示：三十年來我都在考慮要如何才能建造一輛在水下滑翔的汽車做a免费视频播放网站。

This paper based on the principle of having the underwater explosion as a interference source to make the guidance system of torpedos failure, and according to the similarity theory to equivalent the real situation into test model , and analysis the damage

論文文摘本文基于水下爆炸作為干擾源使魚雷制導(dǎo)系統(tǒng)失靈的原理色色色.com，應(yīng)用相似理論，將實(shí)際情況等效縮比為試驗(yàn)?zāi)Ｐ?1pao精品永远免费网站，分析該等效模型在水下爆炸作用下的破壞情況以及對魚雷自導(dǎo)系統(tǒng)的影響黄视频中文字幕。

I ended up choosing two one for use almost everywhere including the beach, and one for use underwater while snorkelling and diving.

最終，我選擇了兩臺：一臺用來在包括海灘在內(nèi)的幾乎所有地方拍攝日韩无码超碰官网，一臺用來在我浮潛和潛水時(shí)在水下拍攝日本一区二区免费黄色视频。