Tannins from the skins and sometimes stems of grapes and the oak barrels used for aging cause the bitter or astringent aftertaste in some red wines.
在一些红葡萄酒中，葡萄皮、葡萄梗和熟成用的橡木桶所带来的单宁会给人带来苦味或收敛性的感觉。
Rhizobia establish a symbiotic relationship with their host plant ― exchanging nitrogen for nutrients ― by forming nodules, which penetrate the roots and sometimes stems of the plant.
根瘤菌通过形成根瘤和它们的宿主建立了一种共生关系——用氮换取营养。 根瘤通常会渗透进植物的根，有时候还会渗透进植物的茎。
But, sometimes, that fatigue stems from low iron stores, particularly prevalent among women in their 20s and 30s, who don’t eat much meat.
但有时身体缺铁会导致疲劳。特别是20岁至30岁的女性，由于少食肉类，这种现象尤为普遍。
Sometimes it stems from the fear that an inherited fortune would tempt the children into extravagance and luxury—a grievous sin, considering the blood and tears it took to make.
另外还有些人担心子孙一旦继承这些遗产会堕入骄奢的生活。想想积累财富时所付出的血泪，后代淫逸的日子真是十恶不赦的罪过。
The hillside is held up by clumps of flowers on hairy stems. The petals lavender and white and pink and purple and sometimes a rare, pale blue.
茸茸的茎上鲜花丛生，开满山坡，淡紫的，白色的，粉红的，紫红的，偶尔也有淡蓝的。
The hillside is held up by clumps of flowers on hairy stems. The petals lavender and white and pink and purple and sometimes a rare, pale blue.
茸茸的茎上鲜花丛生，开满山坡，淡紫的，白色的，粉红的，紫红的，偶尔也有淡蓝的。
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