[rú guǒ]
if; in case; in the event of; supposing that
Were this to happen ...
如果這樣
If it hadn't been for him, we would have gone astray.
如果不是他的話，我們就迷路了。
In case she comes, let me know.
如果她來的話，告訴我一聲。
If it were not for the vapour in the air, there would be no dew.
如果空氣中沒有水氣，就沒有露水。
If necessary, we can use aluminium instead of steel.
如果必要，我們可用鋁代鋼。
We can't keep abreast of the developing situation unless we study harder.
我們如果不加強學習， 就會跟不上形勢。
The object of these experiments was to find the connection, if any, between the two phenomena.
這些實驗的目的就是探索這兩種現(xiàn)象之間的聯(lián)系，如果存在著任何聯(lián)系的話。
In the event (that) our team wins, there will be a celebration.
如果我隊獲勝， 我們將慶祝一番。
In the event of fire, ring the alarm bell.
如果著火， 就按警鈴。