protoplanet单词基本解析：

n.原行星
n. [天]原行星
n.原行星；

protoplanet变化用词：

protoplanet英英释义：

ProtoplanetProtoplanets are large planetary embryos that originate within protoplanetary discs and have undergone internal melting to produce differentiated interiors. They are believed to form out of kilometer-sized planetesimals that attract each other gravitationally and collide.

以上来源于:Wikipedia

protoplanet中文词源：

protoplanet用法和例句：

protoplanet

Two identical NASA spacecraft are preparing to enter areas in space known as the Lagrangian points where remains of this mystery protoplanet may be hiding.

NASA将发射2个完全相同的航天器到天空中的拉格朗日点，去寻找那个神秘行星的遗迹（拉格朗日点是那个神秘行星残余最可能的藏身处）。

In the meantime the protoplanet cores were proceeding to consolidate.

在此期间，原行星的核开始凝成。

用作名词(n.)

In the meantime the protoplanet cores were proceeding to consolidate.
在此期间，原行星的核开始凝成。

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