The no-break mechanical pencil allows the lead to flex under pressure without breaking. It is an innovative product and has relatively recently come on the market to buy. They are not easy to find and purchase in UK shops, however they are available at some online stores.
Explanation: A mechanical pencil uses liquid graphite to produce a continuous stream of pencil as it is used.
Example sentence:
"I prefer writing with a liquid graphite pencil as it seems neater than pen."
シャープペンシルは、鉛筆の書く流れをよくするために液体の黒鉛を使っています。
例文：
"I prefer writing with a liquid graphite pencil as it seems neater than pen."
液体の黒鉛筆で書く方が、ペンよりもきれいに見えるので好きです。
A mechanical pencil is a pencil that can be extended when the lead runs out to have 'unbreakable lead' means that the lead end will not break and keep going
A liquid pencil has liquid grpahite so it is smooth and constantly writes
This mechanical pencil's lead does not break. - just informing the person that the lead of the mechanical pencil does not break.
My mechanical pencil's lead never breaks on me. - a slightly more personal response that informs the other person that your pencil is reliable.
This mechanical pencil's lead does not break.（このシャーペンの芯は折れません）
- 「このシャーペンの芯は折れない」と伝えています。
My mechanical pencil's lead never breaks on me.（私のシャーペンの芯は絶対に折れません）
- より個人的な意見として、そのシャーペンが信頼できることを伝えています。
a pencil used by mechanics with an unbreakable lead
a mechanical pencil containing an breakable lead
an unbreakable lead within the mechanical pencil
a mechanic is the term used to descbribe someone who works with things such as a mechanical pencil and other mechanical things, such as cars and motors.
unbreakable, something that is unable to break.
イギリス 
カナダ 
