热塑塑料可通过加热和加压成形和再成形，而热固塑料却由于在硬化过程中发生了化学变化而不能再成形。
Thermoplastics can be shaped and reshaped by heat and pressure but thermosets cannot be reshaped because they undergo chemical changes as they harden.
这种水泥与水混合后会产生化学变化而凝结硬化。
The cement combines chemically with the water it is mixed with, then hardens and strengthens.
热塑塑料可通过加热和加压成形和再成形，而热固塑料却由于在硬化过程中发生了化学变化而不能再成形。
Thermoplastics: Materials which have the property of softening repeatedly on the application of heat, and of hardening again on cooling. Molecules of thermoplastics take the form of long chains.
热塑塑料可通过加热和加压成形和再成形，而热固塑料却由于在硬化过程中发生了化学变化而不能再成形。
Thermoplastics: Materials which have the property of softening repeatedly on the application of heat, and of hardening again on cooling. Molecules of thermoplastics take the form of long chains.
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