Step 1: Walk here WITHOUT HESITATION in the very beginning. You won't be hurt beacuse the level was designed deliberately. It could save lots of time to attain the time achievement. In the picture you can see the safe area clearly.
游戏刚开始就直接走到这里 游戏设计好了你不会受到什么伤害 但不能停 否则就得等下一波时机 你要拿时间成就 这个就很重要 基本上7s到这个地方


Step 2: As usual, infect civilians.
感染 这个都懂的


Step 3: Stand by here. It's the same place in the first picture.
把僵尸都集中在这里 和第一幅图位置一样


Step 4: Walk along the track as curve. It's an improtant tip for dodge bullets.
沿着类似弧线的轨迹走到对面 在这个游戏中 类弧形行进能很有效的减少伤害


Step 5: Wait here till the soldiers reach the line in the picture, then infect them.

Here I want to reveal details that soldiers are faster than civilians even if they are infected, those who still wear helmets So here comes a design for formation: In raid battle, let the soldier zombies go first while in siege battle (like the end of this level), let civilian zombies go first. Later I will show the reason.
在图中位置等待士兵到达 然后感染

这里需要说明一点 士兵比平民移动速度略快一点 这个差异在变成僵尸后仍然存在 所以有时候在阵型上需要有所设计 进行小部分突袭时 让士兵僵尸走在靠前位置 进行大量围攻时（就像这一关） 让平民僵尸走在前面 后面会解释


Step 6: Hide here after adjusting your formation. Your subordinates will attack in this way so you need to infect the nearer soldier when they are drawing fires. Do not forget that you are more valuable than others.

And why it's better to place the soldier zombies a little behind the civilian zombies here?
First, the soldiers will attack the zombies closest to them. The civilian zombies will get hurt and slow down. At the same time, you are approaching them. Then, the soldier zombies will take their place for MT and keep attacking. The zombie leader, you, will play a role of free man. Finally, by this way, maybe all the zombies will be hurt but it will be 2 deaths. That's crucial to 3 stars.
藏在这里微调阵型 让平民僵尸稍微处于突前位置 你下攻击指令后 手下会从上方进攻 所以你要走偏下一点 找压上进攻的漏洞 当然注意自己的存活
为什么调整阵型 让士兵僵尸靠后？进行战斗时你会发现 一开始士兵会攻击突前的平民僵尸 他们被打中后会受伤减速 这个时候你的整体已经突到一半了 而速度更快的士兵僵尸会赶超并且取代平民僵尸 成为新的目标 这个时候已经开始能攻击到士兵了 这样让伤害尽量平分 包括你自己也可以分担一部分 虽然都受了伤 但是能少死几个 死2个以内就有三星了


If you have any problem or advice please tell me.
Thanks for reading.