[87]种草改良面积是指通过人工种草、飞播种草、草原改良、围栏封育等措施进行草原生态修复的面积之和。
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不过，传统的礼数谁都无法省略。他们坚持要按潮汕习俗，带这位游子去吃一碗甜汤。在前往店铺的路上，杜耀豪反复问陈润庭：“这真的是必需的习俗吗？”汤圆很糯，糖水很甜，寓意着团圆美满，但吃在嘴里，杜耀豪却品出了一天之内经历冰火两重天的恍惚。
“When people get hurt around our products, we need to take every ounce of education from it that we can,” Jacob Zeiger, a senior air-safety investigator at Boeing, told me, when I visited the Boeing facility this past December. “These technical findings are sacred.” Within hours of any major incident involving a Boeing plane, Zeiger and his team are notified, and they may spend a week to ten days studying the damage and interviewing the crew, piecing together what went wrong. In 2008, for instance, the engines on a 777 stopped responding, and it crash-landed short of a runway in London, shearing off its landing gear. Afterward, a team of investigators re-created the plane’s fuel system in a Boeing lab. A small heat-exchange unit, they found, had accumulated ice during the flight. Every 777 has since been retrofitted with a new version of the unit. Thanks to decades of such refinements, today’s jets may be the world’s most reliable machines. Flying in them is less likely to kill you than walking on staircases.