33. of the day, of a day

of the day每一天的，當(dāng)時的，當(dāng)代的;
of a day暫時的，不長久的 eg:a famous scientist of the day

34. three of us, the three of us

three of us我們（不止三個）中的三個;
the three of us我們?nèi)齻€（就三個人）eg:The three of us---Tom, Jack and I went to the cinema.

35. by bus, on the bus

by bus表手段，方式，不用冠詞;
on the bus表范圍 eg:They went there by bus.

36. for a moment, for the moment

for a moment 片刻，一會兒;
for the moment暫時，一時 eg:Thinking for a moment, he agreed.