The damage of stubble will influence the quality of its biennial root.

Biennial yellow-flowered Eurasian plant having aromatic leaves used as carminative or flavoring agent; widely cultivated especially as green manure or cover crop.

两年生欧亚植物，花黄色，其叶芳香，用做祛风剂或调味品；广泛栽培，尤其作绿肥或覆盖作物。

Biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop.

两年生欧亚植物，通常有膨胀的可食根；作为粮食作物培植广泛。

DC. Methods: Choose the biennial plant, get rid of50% alabastrums of them, but make another bloom and fruit.

方法：选择二年生长势基本相同的植株，将其中的50%去除花蕾，另外的50%任其开花结果。

The proportion of annual plant and biennial plant decrease gradually and the proportion of perennial plant increases gradually in the course of enclosure.

围封过程中的沙化草地，土壤种子库群落组成中，1、2年生植物所占比例逐渐减小，多年生植物所占比例均逐渐增加。

Biennial plant; valuable honey plant.

两年生植物，是有价值的蜜源植物。

Erect annual or biennial plant grown extensively especially for hay and soil improvement.

直立的一年生或两年生植物，广泛栽培，尤其用于干草和土壤改良。

Conyza canadensis, an biennial or annual composite herb originating from North America, was widely disturbed in China, and now the species has became a common invasive plant.

小飞蓬（Conyza canadensis）为菊科越年生或一年生草本植物，原产北美洲，目前在我国广泛分布，已成为一种常见入侵植物。

Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States.

地中海两年生草本植物，有长茎的紫色舌状花、乳白色树汁和可食用根；已被美国广泛种植。

Celery is the umbrella-type family and biennial herb, also known as celery, celery drugs and Parsnip.

芹菜是伞形花科、二年生的草本植物，又名芹、药芹、蒲芹。

From 1984 to 1985 the author carried the experiment on annual and biennial herb flowers soilless seedling in Northeast Forestry University flowers garden.

于1984年&1985年在东北林业大学花圃，对一二年生草花进行了无土育苗试验。

The biomass of annual herb, biennial herb and annual biennial herb were all lower, but their seed amounts were above half of total;

一年生、二年生和一、二年生草本植物生物量较低，而种子数量占总量的一半以上；

Put in force cost management type as invite bidding and bid to process fair compete between enterprise, it can assure project quality, shorten construct time, reduce project cost and improve invest benefit and society benefit.

施行招投标制的造价管理，使企业之间进行公平竞争，可以确保工程质量，缩短建设工期，降低工程造价，提高投资效益和社会效益。

Margaret, the other sister, was a good-humored, well-disposed girl; but as she had already a good deal of Marianne's romance, without having much of her sense, she did not, at thirteen, bid fair to equal her sisters at a more advanced period of life.

三妹玛格丽特是个快活厚道的小姑娘，不过由于她已经染上了不少玛丽安的浪漫气质，而又不像她那么聪明，处在十三岁的年纪，还不可能赶上涉世较深的姐姐。

A 2 × 2 Polarization-independent Bidirectional Fiber Optical Switch

与偏振无关的双向2×2光纤光开关

The speed of this bidirectional optical switch can reach to femtosecond if a femtosecond laser is used as the control light.

通过输入飞秒量级的控制光，该双向全光开关的速度可以达到飞秒量级。

Under the background of energy saving and consumption reducing, employing power electronics bidirectional switch in AC/ AC and AC/ DC converter has become a hot topic in recent years.

在提倡节能降耗的背景下，电力电子双向开关在AC/AC和AC/DC单级变换器中的应用成为了近年来的研究热点之一。

It Consists of bidirectional switch and zero current switching control technique to achieve on time rectification in the primary circuit. High power factor, high efficency and low THD have been obtained.

电路采用零电流转换方式进行控制，并采用双向开关实现了电路初级的同期整流，从而实现了高功率因子、高效率和低高次谐波的功率因子改善电路。

The proposed auxiliary commutation circuit consists of one resonant inductor and two bidirectional switch, which provides the ZVS condition to the main switch without increasing voltage or current stresses.

提出的辅助变换电路由一个谐振电感和两个双向开关组成，此电路没有增加主开关的电压和电流应力，却给主开关提供了ZVS的条件。

It adopts bidirectional switch and on time rectification, and obtains high power factor, high efficiency and low THD.

它采用双向开关和同期整流，得到了高功率因子、高效率和低高次谐波。

Forecast Control Strategy for Bidirectional Switch AC/ AC Converter

双向开关AC/AC变换器预测控制策略