您要查找的是不是：
- The insurance cover is optional. 保险范围可以随意选择。
- Do you know the constituents of the mixture? 你知道这种混合物的成分吗？
- A 4-speed automatic transmission is optional. 四段自动变速器是可自由选择的。
- An optional academic course or subject. 选修的科目选修课程或课题
- The cassette player is an optional extra in this make of car. 这种型号汽车如需盒式磁带唱机费用另计。
- optional constituents 状元
- You must do it; you have little option. 你必须做,你没有选择的余地。
- It is at your option to stay or leave. 去留随你的便。
- You must do it; you have no option. 你必须做，你没有选择的余地。
- She has taken an option on that piece of land. 她已取得那块土地的购置权。
- Permitting discretion; optional. 允许自行处理的; 随意的
- The former option favours the married man. 前一种选择对已婚男子有利。
- Gibberellin are normal constituents of most plants. 赤霉素是大多数植物正常的组成部分。
- Separation into constituents by chemical reaction. 分解通过化学反应分离成各组成成分
- She has the full support of her constituents. 她得到本区选民的全力支持。
- An apparatus for determining the order of constituents in a biological polymer. 顺序分析仪确定生物学的聚合体中成份顺序的仪器
- Studies on Chemical Constituents of Smilax china L. 菝葜化学成分的研究。
- The constituents of the mixture is two complex. 这种混合物的成分太复杂了。
- Common facilities are optional CORBA services. 公共设施是可选的CORBA服务。
- Chemical Constituents of Sonchus oleraceus L. 苦苣菜的化学成分。
