Sooty shearwaters log almost 40, 000 miles migrating from New Zealand to Alaska and back, while ruby-throated hummingbirds can fly 20 hours without stop migrating across the Gulf of Mexico.
乌黑鹱在新西兰与阿拉斯加之间来回迁徙，期间飞行的距离几近40000英里；而红宝石喉蜂鸟在跨越墨西哥湾的途中，能够连续不停地飞行20小时。
A pilot in training has to log up a certain number of hours of flying alone before he is allowed to fly passengers.
受训的飞机驾驶员得有单独飞行一定时数的记录以后才允许驾驶客机。
Especially in paper making field, fly ash superfine fibre can replace wood pulp, which can save log consumption and protect woods resource.
尤其在造纸领域，粉煤灰超细纤维可部分取代木浆配抄纸品，节省原木耗费，对保护森林资源起积极作用。
Especially in paper making field, fly ash superfine fibre can replace wood pulp, which can save log consumption and protect woods resource.
尤其在造纸领域，粉煤灰超细纤维可部分取代木浆配抄纸品，节省原木耗费，对保护森林资源起积极作用。
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