2のn乗の英語

a power of 2

binomial expression

a second‐class passenger

having been made square

I travel second class.

a half―one-half（1/2）

a second-class seat

15. Five times three is fifteen.

Five (multiplied) by three make(s) fifteen.

Three fives are fifteen.

a private jinrikisha

Bravo!―Well done!―（競技なら）―Well played!

8. Two from ten leaves [is] eight.

Ten minus two equals [is equal to] eight.

I am very fortunate

It is a blessing I do not deserve.

to blow one's nose on （or into） a handkerchief

Just a line to say...

to get a by-blow in another's quarrel―（より）―to be involved in a quarrel―embroiled in a quarrel

to gird up one's loins

the condition of being a fanatic follower of the Nichiren sect

to be in trouble

a nominal court service

by a factor of two

divisible by two

a two-seater

a twofold increase

double a sum

a double size

being twofold