1. came as 发生于……之际
The deadly attack came as the minority Shiite community of Pakistan was getting ready to mark its annual mourning known as Ashoura.
这次致命袭击发生时，巴基斯坦少数派什叶派聚居区正准备开始他们每年一度的阿舒拉节的悼念活动|L6n%D)EV3=U4[v-2tS。

2. for fear of sth. 以防；出于……考虑
He had not tried to interview them in Mexico for fear of his safety.
出于安全考虑，他没和他们在墨西哥免谈)Ua4CCNq%9z&@_=1H)Uz。

3. tend to sb. 照料；整理
The owner came out in the middle of the night and tended to the garden and that was why we had never seen him.
房主半夜出去打理他的花园去了，所以我们才没看到他LvUJs3Vwc|02fszu274K。

4. as to 至于
As to the question of the origin of things, man can only wonder and doubt and guess.
至于万物起源这一问题，人类只能感到惊奇，疑惑，猜想其答案phs.S|rOI_QGond|]。