介绍： seal
n. 密封；印章；海豹；封条；标志
vt. 密封；盖章
vi. 猎海豹
He sealed the envelope and put on a stamp.
他封好信封，贴了张邮票。

seasonal
adj. 季节的；周期性的；依照季节的
The figures aren't adjusted for seasonal variations.
这些数字未作季节性变化调整。

sector
n. 部门；扇形，扇区；象限仪；函数尺
vt. 把…...

介绍： seal
n. 密封；印章；海豹；封条；标志
vt. 密封；盖章
vi. 猎海豹
He sealed the envelope and put on a stamp.
他封好信封，贴了张邮票。

seasonal
adj. 季节的；周期性的；依照季节的
The figures aren't adjusted for seasonal variations.
这些数字未作季节性变化调整。

sector
n. 部门；扇形，扇区；象限仪；函数尺
vt. 把…分成扇形
Workers who went to the Gulf came from the poorest sectors of Pakistani society.
去海湾的工人们来自巴基斯坦社会最贫穷的阶层。

secure
adj. 安全的；无虑的；有把握的；稳当的
vt. 保护；弄到；招致；缚住
vi. 获得安全；船抛锚；停止工作
Federal leaders continued their efforts to secure a ceasefire.
联邦政府的领导人们继续他们争取停火的努力。

sediment
n. 沉积；沉淀物
Many organisms that die in the sea are soon buried by sediment.
许多在海里死亡的生物很快便被沉淀物掩埋。

seminar
n. 讨论会，研讨班
Students are asked to prepare material in advance of each weekly seminar.
要求学生为每星期一次的研讨班预先准备好材料。

senior
adj. 高级的；年长的；地位较高的；年资较深的，资格较老的
n. 上司；较年长者；毕业班学生
The position had to be filled by an officer senior to Haig.
这个位置必须由一名职位比黑格高的军官来填补。

sensation
n. 感觉；轰动；感动
The pain was so bad that she lost all sensation.
疼得太厉害了，她完全失去了感觉能力。

sequence
n. [数][计] 序列；顺序；续发事件
vt. 按顺序排好
The cultural relics are displayed in chronological sequence.
文物按年代顺序展出。