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(1) The essence of language is human activity. 

(2) All human activity is prompted by desire. Bertrand Russell 

(3) Learning is both a conscious and an unconscious human activity.

(4) In no other field of human activity is there such a proliferation of specialized physiques.

(5) Further evidence of human activity is to be found in the gentle hills which form the northern edge of the Scotscraig valley.

(6) Most climate scientists now agree that human activity is the main cause of global warming.

(7) Art is a human activity which has as its purpose the transmission to others of the highest and best feelings to which men have risen. Leo Tolstoy 

(8) In any case, human activity was not the only factor in the observances.

(9) It is inevitable that all human activity is error-prone.

(10) Aviation is still quite a recent human activity.

(11) Now, technology has entered all areas of human activity.

(12) In the field of purposive human activity, which includes the domain of the law , value and being are not two different things in Fuller's view, but rather[sentencedict.com], two aspects of an integral reality.

(13) As an important tool of human activity, the ship has a long history of the development.

(14) For working purposes one can simplify this still further and define sites as places where significant traces of human activity are identified.

(15) The second is the simple case that before dawn, the background noise caused by human activity tends to be much less.

(16) It has no other being except that which is bestowed upon it by human activity and consciousness.

(17) Indeed, the sea can be a dull subject when not seen as the setting for human activity and emotion.

(18) Meanwhile, worried scientists have moved beyond offering proof of the ill effects of human activity to proposing solutions.

(19) Weldon studied crabs in Plymouth harbour that were being forced to live in water that was muddied by human activity.

(20) The navy says that burial at sea is less expensive, demands less shipyard work[sentencedict.com], and is isolated from human activity.

(21) In advancing the tenets of racism, Western theorists left no avenue of human potentiality and human activity untouched.

(22) Add a global perspective and you up the scale to cover the entire planetary network of human activity.

(23) At worst there is a parochialism about this culture even though its completeness embraces a wide range of human activity and potential.

(24) eg: Today, we realize, perhaps more than ever, that the world of human activity also has its own "Butterfly Effect" for better or for worse.

(25) Developed earlier, as early as the Neolithic period of human activity there.

(26) Microfossil charcoal is one of the important proxies for exploring fire history and ancient human activity.

(27) Disaster mechanism mainly plant's biology characteristic and suitable geographical environment as well as human activity influence.

(28) Beijing ape-man site in Zhoukoudian is a site with most abundant connotation, complete data and most important value in the world, which is also a site with 700000 years pre - history human activity.

(29) But cement manufacturing produces around 5 % of of the carbon dioxide released by human activity worldwide.

(30) But this reef fish could be in danger of losing its smarts as levels of CO2 in the ocean continue to rise due to human activity, according to a new study.