Definition1
the 100th part of a meter
centimeter
one of the parts of a bird or insect used in flying
wing
世界で最も小さな鳥
美しい森
a beautiful forest
I know [ is / the hospital / where ].
I know where the hospital is.
any small creature having six legs and a body divided into three parts
insect
move lightly up and down
flap
as little as 5cm
わずか５ｃｍ
一滴の水
a drop of water
Please tell me [ laughing / Mana / is / Why ].
Please tell me why Mana is laughing.
move with force and speed
rush
make a continuous murmuring sound like the sound made by bees
hum
weigh only 2gm
2グラムの重さしかない。（重さはたった2グラムだ。）
It never gave up.
I don't know [ found /how / the picture / Ken ].
I don't know how Ken found the picture.
the sweet liquid in flowers which bees make into honey
nectar
a small, brightly colored American bird that hovers over flowers with rapidly moving wings that make a humming sound
humming bird
keep flying in the air
彼らは何もできなかった。
They could do nothing.
Do you know [ arrive / Sam / when / will ]?
Do you know when Sam will arrive?
remain in or near one place in the air
hover
a terrible accident (e.g. a great flood, a big fire, an earthquake, the loss of a large sum of money)
disaster
back and force rapidly
すばやく前後に
I'm (just) doing what I can.
Let's think about [ do / should / we / what ].
Let's think about what we should do.