Although often extensive, it was only discovered with the advent of electron microscopy.
Although often extensive, it was only discovered with the advent of electron microscopy.
内质网分布很广泛，但由于十分微小，所以当电子显微镜发明后人们才能够的看到它的存在。
Although often extensive, it was only discovered with the advent of electron microscopy.
内质网分布很广泛，但由于十分微小，所以当电子显微镜发明后人们才能够的看到它的存在。