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- first sepal primordium 第一个萼片原茎
- After sepal primordial appear, the abaxial sepal primordium begin to overlie the dome-shaped flower primordium, at the same time stamens primordium begein to development, however petal primordium does not appear. 形态学观察表明，在花发育早期阶段，无花瓣突变体和有花瓣近等基因系之间花蕾形态学特征基本相同，在花原基上靠近顶端半球形生长锥的下方形成环状隆起，随后分化出4个新月形萼片原基，在将四川大学硕士学位论文尊片合龙时出现雄蕊原基，然而均未观察到花瓣原基。
- In Brasenia, 3 sepal primordia and 3 petal primordia initiated stimultaneously in each whorl. 结果表明：1．莼菜的萼片和花瓣各3枚，都为轮状同时发生；
- The initiation of sepal primordia ; 2. The initiation of one petal and one staminode primordia ; 3. The initiation of two stamen primordia. 萼片原基的发生;一个萼片原基小;另外两个等大;2.;一个花瓣原基和一个退化雄蕊原基的发生;3
- Leaving her first job was a watershed in her life. 辞去她的第一份工作是她生活中的一个转折点。
- Cook the meat quickly at first to seal in the juices. 一开始要大火烧肉，以便保存肉汁。
- In the word "mother" the stress is on the first syllable. 在"mother"这一字里，重音在第一个音节上。,在＂mother＂这一字里，重音在第一个音节上。
- His illness was more serious than the doctor first thought. 他的病较医生原来以为的更严重。
- Passengers with cars must embark first. 带汽车的乘客必须先上船。
- Bob teed off on the new pitcher's first delivery. 鲍勃猛击那新投手所投的第一个球。
- Alarmed at the first sound, we hit the dirt. 第一声警报一响我们就迅速卧倒。
- She struck up the first carol on the grand piano. 她在那架大钢琴上演奏起第一支颂歌。
- He picked a winning number on the first draw. 他第一次便抽到一个中奖号码。
- Slop out the waste basins first when you get up. 起床的第一件事是把例盆倒了。
- The runner was retired put out at first base. 跑垒者于第一垒上被刺杀出局。
- They drew lots for the right to go first. 他们抓阄儿决定谁先走。
- Our reporter was the first person on the scene. 我们的记者是最先到达出事地点的。
- We got knocked out of the Cup in the first round. 我们在锦标赛的第一轮比赛中就被淘汰了。
- He overlooked a spelling error on the first page. 他没有看出第一页中有个拼写错误。
- A slow theme introduces the first movement. 第一乐章以缓慢的主旋律开始。
