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The spore germination and gametophyte development of 21 ferns are studied. It indicates that :① the development period of prothallium and young sporophyte of the same species is different due to seeding time of spores;② the optimal temperatures of spores germination and gametophyte development of 21 ferns are about 15 -24 ℃;③ the rate of spore germination of rare ferns is much lower than the ferns which occur large populations in nature;④ the treatment with GA 3 can accelerate the germination of the spores;⑤ the prothallium changes from large to small, green to yellow when young sporophyte comes out. The prothalliums of all 21 ferns die away after the appear of the 3rd leaf of sporophytes;⑥ shapes of the 1st and 2nd leaves of the young sporophyte are different from those emerged later;⑦ spores cultured in dark can not germinate;⑧ a prothallium can develop only one young sporophyte though it has many archegoniums, and the spore propagation with leaf mould substrate is an economical method.

摘 要：以腐叶土为培养基质，对 21 种蕨类植物进行了孢子萌发和原叶体发育的研究，结果表明：①不同时期播种的同种蕨类的孢子，发育出原叶体和幼孢子体所历经的时间长短不同；②孢子萌发和配子体生长发育的适宜温度约为 15 ～ 24 ℃；③稀有蕨类的孢子萌发率低，而在野外能形成较大种群的蕨类的孢子萌发率高；④用 GA 3 处理孢子可以促进萌发；⑤当原叶体上长出幼孢子体时，原叶体由大变小，由绿变黄， 21 种蕨类的原叶体都在幼孢子体上长出第 3 片叶时消失；⑥幼孢子体上长出的第 1 、 2 片叶在形态上与以后长出的叶不同；⑦孢子萌发需要光；⑧ 1 片原叶体尽管有多个颈卵器，但仅发育出 1 株幼孢子体；⑨利用腐叶土进行蕨类孢子繁殖是一种经济实用的繁殖方法。

Barbour, The Quakers in Puritan England; WC Braithwaite, The Beginnings of Quakerism and The Second Period of Quakerism; RM Jones, The Later Periods of Quakerism; E Russell, The History of Quakerism; DE Trueblood, The People Called Quakers; MH Bacon, The Quiet Rebels; AN Brayshaw, The Quakers: Their Story and Message; HH Brinton, Friends for Three Hundred Years; WR Williams, The Rich Heritage of Quakerism.

巴伯，公谊会在英格兰清教徒；厕所布雷斯韦特，的起源Quakerism和第二期的Quakerism ；产品琼斯，在后期Quakerism ；电子邮件罗素，史Quakerism ；德国特鲁布拉德，人们称为谊；充电器培根，安静的叛乱分子，一个布雷肖，公谊：他们的故事和消息；时时林顿，友三百年；水利威廉姆斯的丰富遗产， Quakerism 。

The innocent world of "Swallows and Amazons" stands in stark contrast to Ransome's earlier incarnation as a British spy and apologist for the Bolsheviks. Between 1913 and 1924 Ransome lived largely in Russia and the Baltic states, from where he reported on the seismic events of the revolutionary period, for the Daily News and later the Manchester Guardian.

燕子与鹦鹉》中单纯的世界与Ransome的早年真实生活形成鲜明对比，他曾是一名英国间谍，还是一名布尔什维克的拥护者。1913到1924年间，Ransome长期居住在俄国和波罗的海诸国，在那儿他负责报道革命期间的地震事件，先为《每日新闻》工作，后来跳到《曼彻斯特卫报》。

Article 121 As regards all leases of land granted or renewed where the original leases contain no right of renewal, during the period from 27 May 1985 to 30 June 1997, which extend beyond 30 June 1997 and expire not later than 30 June 2047, the lessee is not required to pay an additional premium as from 1 July 1997, but an annual rent equivalent to 3 per cent of the rateable value of the property at that date, adjusted in step with any changes in the rateable value thereafter, shall be charged.

第一百二十一条从一九八五年五月二十七日至一九九七年六月三十日期间批出的，或原没有续期权利而获得续期的，超出一九九七年六月三十日年期而不超过二零四七年六月三十日的一切土地契约，承租人从一九九七年七月一日起不补地价，但需每年缴纳相当于当日该土地应课差饷租值百分之三的租金。

Teeth of the total were revisited 2 years later and 2-year success rate were evaluated.Results The ratios of adequate filling, underfilling, and overfilling were 79.97%, 14.62% and 5.41%, receptively. Full canal RCT ratio of molar was 89.44%. Average RCT treatment period was 2.8 weeks. 2-year success rate of RCT was 94.39%.

下面就四川大学华西口腔医院牙体牙髓科 2 0 0 1～ 2 0 0 2年RCT的临床质量作一评价。1 材料和方法1.1 研究对象随机选择 2 0 0 1年 3月～ 2 0 0 2年 2月在四川大学华西口腔医院牙体牙髓科因牙髓病和根尖周病完成RCT治疗的 10 89例患者的 14 2 3颗患牙为研究对象。

Furthermore, how to apply the model efficiently in practice is deeply discussed. As the variance produced by the forecasting model as concerned, the real-time revised method of hydrological forecasting is highlighted. Next arranged, the multi-stratum recursive prediction model is put forward to forecast the error series that is a dynamic system. Later, an error selfregressive multi-stratum recursive prediction model is set up as well as a current algorithm offered. Finally, the difference collated model and the gloss control method, which are devoted to updating the mid-long term hydrological forecasting during the meditate period, are put forward.

在综合评述中长期水文预报现有方法和模型的基础上，采用时间序列分析方法，建立中长期水文预报的时间序列组合模型，并对模型如何在实际中有效应用作了较为深入的探讨；针对模型预报所产生的误差，又重点研究了水文预报实时修正方法：提出了采用多层递阶预报方法对误差序列这一动态系统进行预报，建立了误差自回归多层递阶预报模型，并提出了较为通用的解算方法；给出了水文中长期预报中期修正的残差相关模型和总量控制方法。

The approach of a mid-latitude trough will cause the weakness to widen, which should lead to a recurvature later in the forecast period.

预料一道西风槽的到来将令弱点扩大，彩云届时将会转向。

The approach of a mid-latitude trough will cause the ridge to weaken, which should lead to a recurvature later in the forecast period.

一道西风槽将於后期令副高减弱并出现弱点，彩云届时将会转向。

The most reliable way to determine a food allergy is to have the patient eliminate a suspected food from the diet for a period of time and then reintroduce it later.

最可靠的方法来确定食物过敏是让病人消除了从一段时期的饮食怀疑食物中毒，然后重新它。

The research of the dividend policy in the early period in Western society concerns whether the dividend policy will affect the value of the company or not,hence,formed the unrelated theory and related theory;later on the baisi of identity of relater theory of divident,formed the theories of tax clientele effects,in...

西方股利理论研究的前期关注的是股利政策是否影响公司价值，形成股利无关论和股利相关论，后期在基本认同股利相关论的基础上，形成客户效应理论、信号传递理论和代理成本理论，但诸多理论在总体上缺乏概括性、可操作性，并没有坚持企业价值最大化的原则性目标。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。