seabirds nesting on rocky ledges海鸟在岩架上筑巢Worn blackened window - ledges catch the eye , whose delicate carving can scarcely distinguished.有些地方,露出破旧黝黑的窗槛, 细巧的雕刻已经看不大清.Falcons, found worldwide, commonly nest in tree holes o...
Agar is complex polysaccharide, extracted from red algae.琼脂是一种从红藻中提取的复杂的多糖.The virulent strains had a polysaccharide capsule and formed smooth colonies on agar medium.有毒菌株具有多糖荚膜它在琼脂培养基上形成光滑的菌落.Various overlay mediums , s...