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这双皮鞋太紧，穿着不舒服。
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前两天我刚买了一台彩电，现在手头有点儿紧。
1972年2月21日，美国总统理查德·尼克松访华，受到毛泽东主席的亲切会见。大洋两岸两位巨人的手握到了一起，标志着中美关系揭开了新的篇章，象征着中美关系进入新的时代。 当年，为纪念这一盛事，某航空军工企业，曾根据报刊发表的新闻图片，设计铸造了一枚精美的像章。该章直径29厘米，厚1.2厘米，铝材铸造，重达2870克。章面镌刻毛泽东与尼克松握手这一永恒历史瞬间的半身侧面浮雕像。毛泽东穿中山装，站左面右，尼克松着西服，靠右面左。两人身体微倾，面露微笑，握手交谈，场面生动感人。经与新华社记者拍摄的新闻图片比较，尼克松身高比毛泽东高，会见时单手紧握毛泽东的手，而像章上的形象则相反，微妙地反115}出当时的某种社会心态，深深地烙下了那个特殊时代的印痕。 该像章运用的高浮雕蜡模精密铸造工艺，人物形神兼备，栩栩如生；发丝衣褶，雕琢精细。该章既属特大型半身“右侧面”像章，又是毛泽东像章制佩风潮结束以后出现的、绝无仅有的涉及美国领导人的像章。更为奇特的是，此章是航空军工厂采用制造战斗机的铝合金特制，寓意“铸剑为犁”、“化干戈为玉帛”…… 据考证，此章是1972年2月上海《中美联合公报》发表后，中央有关部门委托第三机械工业部国营东安机械厂设计制作，作为礼物赠送美国朋友的，生产数量不过十来枚，因设计制作时对人物形象作了艺术加工，样品送审未获中央通过，生产计划也未能实施。而已制成的数枚样章则被熔化、销毁，如今仅发现一枚。 根据本文，毛泽东像的位置是______。
The full influence of mechanization began shortly after 1850, when a variety of machines came rapidly into use. The introduction of these machines frequently created rebellions by workers who were fearful that the machines would rob them of their work. Patrick Bell, in Scotland, and Cyrus McCormick, in United States, produced threshing machines. Improve-meats were made in plows to compensate for different soil types. Stream power came into use in 1860s on large farms. Hay rakes, hay-loaders, and various special harvesting machines were produced, Milking machines appeared. The internal-combustion engine run by gasoline became the chief power source for the farm. In time, the number of certain farm machines that came into use skyrocketed and changed the nature of fanning. Between 1940 and 1960, for example, 12 million horses and mules gave way to 5 million tractors. Tractors offer many features that are attractive to farmers. There are, for example, numerous attachments: cultivators that can penetrate the soil to varying depths, rotary hoes that chop weeds; spray devices that can spray pesticides in bands 100 feet across, and many others. A piece of equipment has now been invented or adapted for virtually every laborious hand or animal operation. On the farm lathe United States, for example, cotton, tobacco, hay, and grain are planted, treated for pests and diseases, fertilized, cultivated and harvested by machine. Large devices shake fruit and nut from trees, gain and blend feed, and dry gain and hay. Equipment is now available to put just the right amount of fertilizer in just the right place, to spray an exact row width, and to count out, Space, and plant just the right number of seeds for a row. Mechanization is not used in agriculture in many parts of Latin America, Africa, Agriculture innovation is accepted fastest where agriculture is already profitable and progressive. Some mechanization has reached the level of plantation agriculture in parts of the tropics, but even today much of that land is laboriously worked by people leading draft animals pal-ling primitive plows. The problems of mechanization in some areas are not only cultural in nature. For examples, tropical soils and crops differ markedly from those in temperate areas that the machines are designed for, so adaptations have to be made. But the greatest obstacle to mechanization is the fear in underdeveloped countries that the workers who are displaced by machines would not find work elsewhere, Introducing mechanization into such areas requires careful planning. The first paragraph uses several examples to convey the ideas that______.
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