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<p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal">Cosmonaut Alexey Leonov (left) and astronaut Deke Slayton (right) frolic during the joint Apollo–Soyuz linkup in July 1975.</p><p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal"><span>1975 </span>年<span>7</span>月，阿波罗<span>-</span>联盟号联合连接期间，宇航员阿列克谢·列昂诺夫（左）和宇航员德克·斯莱顿（右）。</p>