主根（axial root），亦称“初生根”。由胚根发育而成的根。主根具有强烈的向地性，可垂直向土层深处生长2-3米，一般栽培的灌木型茶树根系可深入1米以下的土层。
n. taproot
misc. main root ; principal root ; axial root
... 主表现 principal representation 主根 principal root 二次曲面的主截面 principal section of a quadric ...
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内包头和主根加工机械 Puff and Counter Processing Machine
主根系 taproot system ; [植] axial root system ; tap root system
主根开花 rhizanthous
初生主根 rootstock ; root stalk
非主根函数 surd
狄慈根主义 Dietzgenism
主根和侧根 taprootandlateralroot ; taproot and lateral root
中国特色社会主义的根本原则 the fundamental principle of socialism with Chinese characteristics ; the fundamental principle of Chinese socialism
以保证人民当家作主为根本 On the basis of ensuring the people's position as masters of the country
Seedling branch root number,main root length and root dry weight had significant (P<0.05) positive correlation with droughttolerance.
幼苗侧根数量、主根长度和根系干重与抗旱性呈显著(P<0.05)相关。
参考来源 - 大豆品种抗旱性早期鉴定方法The optimal collecting material of cultivated G. glabra L. were taproot and horizon rhizome. The optimal collecting time was the summer of the third year.
药效最佳的光果甘草材料为1、2年生夏季根茎;栽培光果甘草的最佳采收材料为其主根和水平根,采收时期为第3年夏季。
参考来源 - 四种甘草的甘草酸与总黄酮含量及抗肿瘤活性比较From the tap root of Panax notoginseng,ten compounds were isolated by repeated column chromatography with silica gel and C18. Their structures were identified by spectroscopic methods as ginsenoside Rh4(1),notoginsenoside R2(2),ginsenoside Rh1(3),ginsenoside F1(4),20(S)-ginsenoside Rg2(5),3-O-β-D-glucopyranosyl-(12)-β-D-glucopyranoside-12β,25-dihydroxydammar-(E)20(22)-ene(6),vinaginsenoside R15(7),vinaginsenside R3(8),pseudoginsenoside RT3(9),and 6-O-(β-D-glucopyranosyl)-20-O-(β-D-xylopyranosyl)-3β,6α,12β,20(S)-tetrahydroxydammar-24-ene(10),respectively.
利用硅胶、C18等柱色谱技术对三七(Panax notoginseng(Burk)F.H.Chen)主根中微量成分进行分离纯化,分离得到10个化合物,通过NMR、MS等波谱技术鉴定化合物的结构,10个化合物分别为:人参皂苷Rh4(1),20(S)-三七皂苷R2(2),人参皂苷Rh1(3),人参皂苷F1(4),20(S)-ginsenoside Rg2(5),3-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyrano-side-12β,25-dihydroxydammar-(E)-20(22)-ene(6),vinaginsenoside R15(7),vinaginsenoside R3(8),pseudoginsenoside RT3(9),and 6-O-(β-D-glucopyranosyl)-20-O-(β-D-xylopyranosyl)-3β,6α,12β,20(S)-tetrahydroxydammar-24-ene(10)。
参考来源 - 三七主根的微量皂苷类成分研究·2,447,543篇论文数据，部分数据来源于NoteExpress
他们也知道有更强大、更可靠、更快速的系统，但他们的雇主根本不会提供资金来购买这些系统。
They are also the ones who know there are systems that are more powerful, reliable and faster, but their employer simply will not put up the funds to buy them.
这类植物通过生长出长长的主根来适应环境，这些主根可以向下渗透，直达地下水提供的充足水源。
These have adapted to the environment by the development of long taproots that penetrate downward until they approach the assured water supply provided by groundwater.
主根垂直向下生长，以固定树身，并吸取深处的水分。
The taproot grows straight down to anchor the tree and reach for deep water.
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