She had a pleased look on his face.
burn down, burn up, burn out
bum down 指"烧为平地,烧毁";也指"火力减弱"。
The house was burnt down in an hour.
You'd better put more wood on the fire to make it burn up.
The fire had burnt out before I returned.
elect 只能用于选举人,是投票选举的正式用语。
They elected Nixon President. 他们选尼克松为总统。
It's hard for me to choose one from so many pairs of shoes.
She selected a pair of socks to match her suit.
be known for, be known as, be known to
be known for 以……出了名 (通常不是指同位的关系)
be known as 作为……出了名 (通常加上职业名词,表同位关系)
Japan is known for its cars.
Luxun is known as a writer.
As is known to all, China has four famous invitations.
当"观察"来讲时,observe相当于watch carefully,尤其用于实验或研究等场合。具体来说,observe含有"察觉到"的意思,watch意为"盯着看"。
watch还含有"观看(比赛、电视)"等,而observe没有此意。另外,watch还有"照料"之意,相当于take care of。还有"当心"之意,相当于be careful with。
She has observed the stars all her life.
I'll watch the baby while you are away.
You'd better watch Mr Smith, I think he is a thief.