♣ die 常用短语
die for one's country 为国捐躯
die down 熄灭、平息
die off 绝种、枯死
die away 消逝、静下来
die a heroic death 英勇牺牲

die of 与 die from 的区别
die of 表示“死于……病”或冻死、气死，或死于过度悲伤。
die of cancer/ grief/ hunger/ anger/ cold
die from 表示死于外伤、事故、劳累过度。如：
die from polluted air/ overwork/ sword thrust

♣ threaten 常用短语
threaten sb. with sth. 用……威胁某人
threaten to do … 威胁做……
under the threat of … 在……的威胁下

♣ speed 常用短语
speed up加速
at the speed of … 以……的速度
with great speed 迅速

♣ aim 常用短语
take aim at 瞄准
reach an aim 达到目的
aim at 瞄准、针对

permit 与 allow 的区别
表“允许做某事”或“允许某人做某事”用法基本相同。
permit/ allow doing sth.
permit/ allow sb. to do sth.
permit / allow of sth
一般在独立主格结构中表示“时间、条件等许可”，多用 permit
Time/ Weather permitting, I'll drop in on her.
allow 还可以表示“承认”、“考虑到”。例如：
1. We allow him to be wronged.
2. will take an hour to go there, allowing for traffic delays.

♣ means 常用短语
by means of 通过……, 靠……
by this means/ in this way 用这种方法
by no means/ in no case 决不
by all means 用一切办法

♣ keep 常用短语
keep up with 紧跟 ……
keep sb. doing sth. 让某人一直做
keep sb. from doing sth. 阻止……做……
keep off the grass 勿踏草地
keep to the point 紧扣主题
keep in touch with 与……保持联系